[canvaskit] Optimize CK builds for size

  canvaskit.wasm:   6855515 -> 5445330
  canvaskit.wasm.gz 2554712 -> 2189897

Change-Id: I9749cf8dc66e08eb95c2f996d5b631d5fcdff342
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/229078
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
diff --git a/modules/canvaskit/compile.sh b/modules/canvaskit/compile.sh
index 5eb4fc1..1cd10c6 100755
--- a/modules/canvaskit/compile.sh
+++ b/modules/canvaskit/compile.sh
@@ -22,7 +22,7 @@
 
 RELEASE_CONF="-Oz --closure 1 --llvm-lto 3 -DSK_RELEASE --pre-js $BASE_DIR/release.js \
               -DGR_GL_CHECK_ALLOC_WITH_GET_ERROR=0"
-EXTRA_CFLAGS="\"-DSK_RELEASE\", \"-DGR_GL_CHECK_ALLOC_WITH_GET_ERROR=0\","
+EXTRA_CFLAGS="\"-Oz\", \"-DSK_RELEASE\", \"-DGR_GL_CHECK_ALLOC_WITH_GET_ERROR=0\","
 if [[ $@ == *debug* ]]; then
   echo "Building a Debug build"
   EXTRA_CFLAGS="\"-DSK_DEBUG\""