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The purpose of the transparency clip is to give Skia raster hints so that
a transparent layer can be sized according to the bounding box of contents
being composited. The clip itself should be no-op, but will actually cause
anti-alias artifact for transformed contents.

Removing the transparency clip and use compositing bound will allow Skia
to take account of anti-aliasing to properly size the transparent layer.

BUG=524859

Review URL: https://codereview.chromium.org/1311633004

git-svn-id: svn://svn.chromium.org/blink/trunk@201202 bbb929c8-8fbe-4397-9dbb-9b2b20218538