diff --git a/tools/run-wasm-gm-tests/package-lock.json b/tools/run-wasm-gm-tests/package-lock.json
new file mode 100644
index 0000000..67051a4
--- /dev/null
+++ b/tools/run-wasm-gm-tests/package-lock.json
@@ -0,0 +1,913 @@
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+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
+      "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
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diff --git a/tools/run-wasm-gm-tests/package.json b/tools/run-wasm-gm-tests/package.json
new file mode 100644
index 0000000..fe4477f
--- /dev/null
+++ b/tools/run-wasm-gm-tests/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "run-wasm-gm-tests",
+  "version": "0.0.0",
+  "description": "",
+  "main": "index.js",
+  "dependencies": {
+    "body-parser": "^1.19.0",
+    "command-line-args": "^5.0.2",
+    "command-line-usage": "^5.0.3",
+    "express": "^4.16.3",
+    "puppeteer": "^3.0.4"
+  },
+  "devDependencies": {},
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC"
+}
diff --git a/tools/run-wasm-gm-tests/run-wasm-gm-tests.html b/tools/run-wasm-gm-tests/run-wasm-gm-tests.html
new file mode 100644
index 0000000..aeac0bc
--- /dev/null
+++ b/tools/run-wasm-gm-tests/run-wasm-gm-tests.html
@@ -0,0 +1,118 @@
+<!-- This runs the GMs and unit tests which have been compiled to WASM. When this completes,
+either window._error will be set or window._testsDone will be true and window._results will be an
+array of the test names and what they drew.
+-->
+<!DOCTYPE html>
+<html>
+<head>
+  <title>CanvasKit SKP Perf</title>
+  <meta charset="utf-8" />
+  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <script src="/static/wasm_gm_tests.js" type="text/javascript" charset="utf-8"></script>
+  <style type="text/css" media="screen">
+    #status_text {
+      min-width: 900px;
+      min-height: 500px;
+    }
+  </style>
+</head>
+<body>
+<main>
+  <button id=start_tests>Start Tests</button>
+  <br>
+  <pre id=status_text></pre>
+
+  <canvas id=gm_canvas></canvas>
+</main>
+<script type="text/javascript" charset="utf-8">
+  const loadTestsPromise = InitWasmGMTests({
+    locateFile: (file) => '/static/'+file,
+  });
+
+  const loadKnownHashesPromise = fetch('/static/hashes.txt').then((resp) => resp.text());
+
+  let attemptedPOSTs = 0;
+  let successfulPOSTs = 0;
+  Promise.all([loadTestsPromise, loadKnownHashesPromise]).then(([GM, hashes]) => {
+    LoadKnownHashes(GM, hashes);
+    document.getElementById('start_tests').addEventListener('click', async () => {
+      window._testsProgress = 0;
+      await RunGMs(GM);
+      if (attemptedPOSTs !== successfulPOSTs) {
+        window._error = `Failed to POST all the PNG files (expected ${attemptedPOSTs}, finished ${successfulPOSTs})`;
+      } else {
+        window._testsDone = true;
+      }
+    });
+    window._testsReady = true;
+  });
+
+  const statusElement = document.getElementById('status_text');
+  function logLineToPage(line) {
+    statusElement.innerText += (line + '\n');
+  }
+
+  // There's a global set of known hashes that we preload with the md5 hashes that are already
+  // uploaded to Gold. This saves us some time to encode them and write them to disk.
+  function LoadKnownHashes(GM, hashes) {
+    logLineToPage(`Loading ${hashes.length} hashes`);
+    console.time('load_hashes');
+    for (const hash of hashes.split('\n')) {
+      if (hash.length < 5) { // be sure not to add empty lines
+        continue;
+      }
+      GM.LoadKnownDigest(hash);
+    }
+    console.timeEnd('load_hashes');
+    logLineToPage('hashes loaded');
+  }
+
+  async function RunGMs(GM) {
+    const canvas = document.getElementById('gm_canvas');
+    const ctx = GM.GetWebGLContext(canvas, 2);
+    const grcontext = GM.MakeGrContext(ctx);
+    window._results = [];
+
+    const names = GM.ListGMs();
+    names.sort();
+    for (const name of names) {
+      const pngAndMetadata = GM.RunGM(grcontext, name);
+      if (!pngAndMetadata) {
+        continue;
+      }
+      logLineToPage(`Test ${name} drew ${pngAndMetadata.hash}`);
+      window._results.push({
+        name: name,
+        digest: pngAndMetadata.hash,
+      });
+      if (pngAndMetadata.png) {
+        await postPNG(pngAndMetadata.hash, pngAndMetadata.png);
+      }
+      window._testsProgress++;
+    }
+    grcontext.delete();
+  }
+
+  async function postPNG(hash, data) {
+    attemptedPOSTs += 1;
+    await fetch('/write_png', {
+      method: 'POST',
+      body: data,
+      headers: {
+        'Content-type': 'image/png',
+        'X-MD5-Hash': hash, // this will be used server side to create the name of the png.
+      }
+    }).then((resp) => {
+      if (resp.ok) {
+        successfulPOSTs += 1;
+      } else {
+        console.error('not ok response', resp);
+      }
+    }).catch((e) => {
+      console.error('Could not post PNG', e);
+    });
+  }
+</script>
+</body>
+</html>
diff --git a/tools/run-wasm-gm-tests/run-wasm-gm-tests.js b/tools/run-wasm-gm-tests/run-wasm-gm-tests.js
new file mode 100644
index 0000000..6bf8565
--- /dev/null
+++ b/tools/run-wasm-gm-tests/run-wasm-gm-tests.js
@@ -0,0 +1,255 @@
+/**
+ * Command line application to test GMS and unit tests with puppeteer.
+ * node run-wasm-gm-tests --js_file ../../out/wasm_gm_tests/wasm_gm_tests.js --wasm_file ../../out/wasm_gm_tests/wasm_gm_tests.wasm --known_hashes /tmp/gold2/tests/hashes.txt --output /tmp/gold2/tests/ --use_gpu --timeout 180
+ */
+const puppeteer = require('puppeteer');
+const express = require('express');
+const path = require('path');
+const bodyParser = require('body-parser');
+const fs = require('fs');
+const commandLineArgs = require('command-line-args');
+const commandLineUsage = require('command-line-usage');
+
+const opts = [
+  {
+    name: 'js_file',
+    typeLabel: '{underline file}',
+    description: '(required) The path to wasm_gm_tests.js.'
+  },
+  {
+    name: 'wasm_file',
+    typeLabel: '{underline file}',
+    description: '(required) The path to wasm_gm_tests.wasm.'
+  },
+  {
+    name: 'known_hashes',
+    typeLabel: '{underline file}',
+    description: '(required) A directory containing any assets needed by lottie' +
+      ' files or tests (e.g. images/fonts).'
+  },
+  {
+    name: 'output',
+    typeLabel: '{underline file}',
+    description: '(required) The directory to write the output JSON and images to.',
+  },
+  {
+    name: 'use_gpu',
+    description: 'Whether we should run in non-headless mode with GPU.',
+    type: Boolean,
+  },
+  {
+    name: 'enable_simd',
+    description: 'enable execution of wasm SIMD operations in chromium',
+    type: Boolean
+  },
+  {
+    name: 'port',
+    description: 'The port number to use, defaults to 8081.',
+    type: Number,
+  },
+  {
+    name: 'help',
+    alias: 'h',
+    type: Boolean,
+    description: 'Print this usage guide.'
+  },
+  {
+    name: 'timeout',
+    description: 'Number of seconds to allow test to run.',
+    type: Number,
+  },
+];
+
+const usage = [
+  {
+    header: 'Measruing correctness of Skia WASM code',
+    content: 'Command line application to capture images drawn from tests',
+  },
+  {
+    header: 'Options',
+    optionList: opts,
+  },
+];
+
+// Parse and validate flags.
+const options = commandLineArgs(opts);
+
+if (!options.port) {
+  options.port = 8081;
+}
+if (!options.timeout) {
+  options.timeout = 60;
+}
+
+if (options.help) {
+  console.log(commandLineUsage(usage));
+  process.exit(0);
+}
+
+if (!options.output) {
+  console.error('You must supply an output directory.');
+  console.log(commandLineUsage(usage));
+  process.exit(1);
+}
+
+if (!options.js_file) {
+  console.error('You must supply path to wasm_gm_tests.js.');
+  console.log(commandLineUsage(usage));
+  process.exit(1);
+}
+
+if (!options.wasm_file) {
+  console.error('You must supply path to wasm_gm_tests.wasm.');
+  console.log(commandLineUsage(usage));
+  process.exit(1);
+}
+
+if (!options.known_hashes) {
+  console.error('You must supply path to known_hashes.txt');
+  console.log(commandLineUsage(usage));
+  process.exit(1);
+}
+
+const driverHTML = fs.readFileSync('run-wasm-gm-tests.html', 'utf8');
+const testJS = fs.readFileSync(options.js_file, 'utf8');
+const testWASM = fs.readFileSync(options.wasm_file, 'binary');
+const knownHashes = fs.readFileSync(options.known_hashes, 'utf8');
+
+// This express webserver will serve the HTML file running the benchmark and any additional assets
+// needed to run the tests.
+const app = express();
+app.get('/', (req, res) => res.send(driverHTML));
+
+// This allows the server to receive POST requests of up to 10MB for image/png and read the body
+// as raw bytes, housed in a buffer.
+app.use(bodyParser.raw({ type: 'image/png', limit: '10mb' }));
+
+app.get('/static/hashes.txt', (req, res) => res.send(knownHashes));
+app.get('/static/wasm_gm_tests.js', (req, res) => res.send(testJS));
+app.get('/static/wasm_gm_tests.wasm', function(req, res) {
+  // Set the MIME type so it can be streamed efficiently.
+  res.type('application/wasm');
+  res.send(new Buffer(testWASM, 'binary'));
+});
+app.post('/write_png', (req, res) => {
+  const md5 = req.header('X-MD5-Hash');
+  if (!md5) {
+    res.sendStatus(400);
+    return;
+  }
+  const data = req.body;
+  const newFile = path.join(options.output, md5 + '.png');
+  fs.writeFileSync(newFile, data, {
+    encoding: 'binary',
+  })
+  res.sendStatus(200);
+});
+
+const server = app.listen(options.port, () => console.log('- Local web server started.'));
+
+const hash = options.use_gpu? '#gpu': '#cpu';
+const targetURL = `http://localhost:${options.port}/${hash}`;
+const viewPort = {width: 1000, height: 1000};
+
+// Drive chrome to load the web page from the server we have running.
+async function driveBrowser() {
+  console.log('- Launching chrome for ' + options.input);
+  const browser_args = [
+    '--no-sandbox',
+    '--disable-setuid-sandbox',
+    '--window-size=' + viewPort.width + ',' + viewPort.height,
+    // The following two params allow Chrome to run at an unlimited fps. Note, if there is
+    // already a chrome instance running, these arguments will have NO EFFECT, as the existing
+    // Chrome instance will be used instead of puppeteer spinning up a new one.
+    '--disable-frame-rate-limit',
+    '--disable-gpu-vsync',
+  ];
+  if (options.enable_simd) {
+    browser_args.push('--enable-features=WebAssemblySimd');
+  }
+  if (options.use_gpu) {
+    browser_args.push('--ignore-gpu-blacklist');
+    browser_args.push('--ignore-gpu-blocklist');
+    browser_args.push('--enable-gpu-rasterization');
+  }
+  const headless = !options.use_gpu;
+  console.log("Running with headless: " + headless + " args: " + browser_args);
+  let browser;
+  let page;
+  try {
+    browser = await puppeteer.launch({
+      headless: headless,
+      args: browser_args,
+      executablePath: options.chromium_executable_path
+    });
+    page = await browser.newPage();
+    await page.setViewport(viewPort);
+  } catch (e) {
+    console.log('Could not open the browser.', e);
+    process.exit(1);
+  }
+  console.log("Loading " + targetURL);
+  try {
+    await page.goto(targetURL, {
+      timeout: 60000,
+      waitUntil: 'networkidle0'
+    });
+
+    // Page is mostly loaded, wait for benchmark page to report itself ready.
+    console.log('Waiting 15s for benchmark to be ready');
+    await page.waitForFunction(`(window._testsReady === true) || window._error`, {
+      timeout: 15000,
+    });
+
+    const err = await page.evaluate('window._error');
+    if (err) {
+      console.log(`ERROR: ${err}`);
+      process.exit(1);
+    }
+
+    // There is a button with id #start_tests to click (this also makes manual debugging easier).
+    await page.click('#start_tests');
+
+    const batchSize = 50;
+    let batch = batchSize;
+    while (true) {
+      console.log(`Waiting ${options.timeout}s for ${batchSize} tests to complete`);
+      await page.waitForFunction(`(window._testsProgress >= ${batch}) || (window._testsDone === true) || window._error`, {
+        timeout: options.timeout*1000,
+      });
+      const progress = await page.evaluate(() => {
+        return {
+          err: window._error,
+          done: window._testsDone,
+          count: window._testsProgress,
+        };
+      });
+      if (progress.err) {
+        console.log(`ERROR: ${progress.err}`);
+        process.exit(1);
+      }
+      if (progress.done) {
+        console.log(`Completed ${progress.count} tests. Finished.`);
+        break;
+      }
+      console.log(`In Progress; completed ${progress.count} tests.`)
+      batch = progress.count + batchSize;
+    }
+
+    const goldResults = await page.evaluate('window._results');
+    console.debug(goldResults);
+
+    const jsonFile = path.join(options.output, 'gold_results.json');
+    fs.writeFileSync(jsonFile, JSON.stringify(goldResults));
+  } catch(e) {
+    console.log('Timed out while loading, drawing, or writing to disk.', e);
+    await browser.close();
+    await new Promise((resolve) => server.close(resolve));
+    process.exit(1);
+  }
+
+  await browser.close();
+  await new Promise((resolve) => server.close(resolve));
+}
+
+driveBrowser();