cc: Test BeginMainFrame values come from BeginImplFrame.
cc: Test BeginMainFrame values come from BeginImplFrame.

The frame time in the BeginFrameArgs sent to BeginMainFrame should match a
value from a BeginImplFrame. However there is not a 1:1 relantionship, when the
main thread is slow, there many be multiple impl frames.

DEPS=http://crrev.com/787763006
BUG=346230
R=brianderson,enne

Review URL: https://codereview.chromium.org/1104193003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#328929}

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