Add a disabler for gathering debug compositing info from FrameView (this code is only executed in about:tracing). BUG=366669
Add a disabler for gathering debug compositing info from FrameView (this code
is only executed in about:tracing).
BUG=366669

Review URL: https://codereview.chromium.org/335273007

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@176766 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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