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This CL add power profiler in DevTools frontend, and draw power data in PowerOverview of Timeline panel.

BUG=337138

Review URL: https://codereview.chromium.org/104523002

git-svn-id: svn://svn.chromium.org/blink/trunk@169951 bbb929c8-8fbe-4397-9dbb-9b2b20218538