wasm: add more debug info, embed profiles/

out/emscripten/tests.html now runs meaningfully for me now,
with expect() failin first on least-significant-digit float
differences in an XYZ matrix in test_Parse().

Will be looking into that next, but this gets things going!

Change-Id: I80befc450eec17640662406aeb80695d0f376d2a
Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/199239
Commit-Queue: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
diff --git a/build/emscripten b/build/emscripten
index eef3b25..cf0d923 100644
--- a/build/emscripten
+++ b/build/emscripten
@@ -1,7 +1,7 @@
 cc      = emcc
 cxx     = em++
-cflags  = -s WASM=1
-ldflags = -s WASM=1
+cflags  = -g3 -s WASM=1
+ldflags = -g3 -s WASM=1 --embed-file profiles
 exe     = .html
 out     = out/emscripten$mode