Adding support for new canvas API method clipRRect with rtree and tileGrid

BUG=http://code.google.com/p/skia/issues/detail?id=1014
TEST=gm rrect_clip_* with --tileGrid and --rtree
Review URL: https://codereview.appspot.com/6939073

git-svn-id: http://skia.googlecode.com/svn/trunk@6883 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed