Fixed frame rate test output for performance dashboard.
Fixed frame rate test output for performance dashboard.

Currently, the frame rate test outputs two graphs, "fps" and "fps_ref." Now it
will output one graph with two traces (for each content). Also, the individual
gesture output is updated to match a future CL that will process it.

TEST=performance_ui_tests --gtest_filter=FrameRateTest*


Review URL: http://codereview.chromium.org/7538003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@94807 0039d316-1c4b-4281-b951-d872f2087c98

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