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Created a new GTK widget that gives us more control over when X windows (associated with GL contexts) are created and destroyed. This achieves the same thing as the overlay code (now reverted). It fixes two regressions with the overlay code:
- maps.google.com and html5test.com now work (switching between software and hardware rendering)
- expose events now get through in accelerated mode
BUG=58862,59887
TEST=Go to html5test.com. Should switch contents to show results. Disable compositing window manager. Go to http://peter.sh/2010/06/chromium-now-features-gpu-acceleration-and-css-3d-transforms/. Adjust the rotate z slider to enable accelerated compositing. Drag a different window over top. Redraws should happen.
Review URL: http://codereview.chromium.org/3973009
Patch from Jonathan Backer <backer@chromium.org>.
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@64291 0039d316-1c4b-4281-b951-d872f2087c98
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