use forward matrix to determine if we can ignore scale part of a matrix Review URL: https://codereview.chromium.org/14018020
use forward matrix to determine if we can ignore scale part of a matrix
Review URL: https://codereview.chromium.org/14018020

git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@8700 2bbb7eff-a529-9590-31e7-b0007b416f81

PurityROM/platform_external_skia,PurityROM/platform_external_skia,PurityROM/platform_external_skia,PurityROM/platform_external_skia