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The gpu_tracer reads back GL timer queries as a delayed task.
During processing the associated GL context wasn't made current, so it
was possible to query the wrong context, get incorrect timestamps, or
cause GL errors.

BUG=331161

Review URL: https://codereview.chromium.org/130313002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244068 0039d316-1c4b-4281-b951-d872f2087c98