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Usage:
1. Install emscripten locally (so that em++ works)
2. Apply the patch file
3. run build_html_viewer.py

Bug: 1011921
Change-Id: I7216f57bdf76da163bff358f6c52953cd36d76da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873284
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709484}