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Adding performance tests that serve to measure how much performance
improvements can be obtained by the addition of willReadFrequently
option. Test cases include multiple draws and multiple getImageData
calls. The canvas-getImageData-smooth.html is corrected and shows that
the discrepancy between cpu and gpu rendering does exist.

Bug: 1090180
Change-Id: I8701f4389d8f0c9a26498d35b874453512e4669f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2231808Reviewed-by: Juanmi Huertas <juanmihd@chromium.org>
Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Commit-Queue: Teresa Kang <teresakang@google.com>
Cr-Commit-Position: refs/heads/master@{#776577}