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The deadline scheduler in the Chrome compositor relies on runtime estimations of
various stages in the rendering pipeline. This patch adds the actual and
estimated runtimes of these stages to RenderingStats so they will be available
in tracing output. This will allow us to tune the estimators.

BUG=243459

Review URL: https://codereview.chromium.org/363003002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284428 0039d316-1c4b-4281-b951-d872f2087c98