Moving updateClipConservativelyUsingBounds into SkCanvas

This method is being moved from SkPictureRecord to become a protected member of SkCanvas so that other classes derived from SkCanvas can use it.
This Patch also applies the fix provided by updateClipConservativelyUsingBounds to SkPictureUtils::GatherPixelRefs

BUG=https://code.google.com/p/chromium/issues/detail?id=244893

Review URL: https://codereview.chromium.org/15894005

git-svn-id: http://skia.googlecode.com/svn/trunk@9326 2bbb7eff-a529-9590-31e7-b0007b416f81
5 files changed