GitLab

This is like we avoid reraster for scale change during pinch gesture
unless the scale is too different.

Also allow recreation of high res tiling if it doesn't contain any
tile or we are going to invalidate the tiles.

This fixes performance regression of pinch perf tests caused by
crrev.com/c/2351164.

Bug: 1117479
Change-Id: Ifc7979af81aa76b0214fda7dc2340be76ae63046
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364583Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800205}