Revert "Revert of https://codereview.chromium.org/112783004/"

This reverts commit 3293fe57a7507541e9040eab880dcd82c43881f4.

Conflicts:
	src/core/SkScaledImageCache.cpp

BUG=

Review URL: https://codereview.chromium.org/108613005

git-svn-id: http://skia.googlecode.com/svn/trunk@12663 2bbb7eff-a529-9590-31e7-b0007b416f81
6 files changed