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Be conservative when lowering down the refresh rate by waiting for a
consistent state for at least 60 frames but immediately switch if the
refresh rate should be increased.

R=dcastagna@chromium.org

Test: FrameRateDeciderTest.TogglesAfterMinNumOfFrames
Bug: 976583
Change-Id: I9483357807e81a28966254e1d89418dd12f03f4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2079264
Commit-Queue: Khushal <khushalsagar@chromium.org>
Auto-Submit: Khushal <khushalsagar@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745726}