Add fixed raster scale use counter histograms.
This patch adds two new values for WebCore.FeatureObserver histogram:
- FixedRasterScale_BlurryContent: this histogram records any time a
layer without will change has a fixed raster scale and the scale does
not match the ideal scale (ie, blurry content)
- FixedRasterScale_PotentialPerformanceRegression: this histogram
records any time we have a non-will change layer that has a fixed
raster scale and it has attempted to change its scale 5 times out of
the last 10 frames.
R=danakj, chrishtr
BUG=609276
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
Review-Url: https://codereview.chromium.org/1946403003
Cr-Commit-Position: refs/heads/master@{#394526}
45 files changed
