Disable GPU compositing and accelerated 2d canvas for about: URLs
Disable GPU compositing and accelerated 2d canvas for about: URLs

This forced GPU compositing and acclerated 2d canvas off for about:
pages like about:gpu, just like it is off for chrome:// and
chrome-devtools:// URLs.  Having these on is problematic especially for
about:gpu since its profiling feature uses 2d canvas extensively and so
attempts to use the GPU profiler can significantly distort the behavior
of the page being profiled.

BUG=none
TEST=none


Review URL: http://codereview.chromium.org/7054046

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@87836 0039d316-1c4b-4281-b951-d872f2087c98

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