Adding chrome side entries for Asm.js / WebAssembly metrics.

BUG=687759
BUG=v8:4203
BUG=575167
TEST=None
R=ahaas@chromium.org,isherman@chromium.org
LOG=N

Review-Url: https://codereview.chromium.org/1890773002
Cr-Commit-Position: refs/heads/master@{#447689}
1 file changed