Avoid unnecessary conversion when clipping
Avoid unnecessary conversion when clipping

Core has many callers to to the IntRect flavor of
GraphicsContext::clip. Previously, the IntRect would be
converted first to a FloatRect, then to an SkRect. This
patch avoid the unnecessary FloatRect intermediary step.

Review URL: https://codereview.chromium.org/197313013

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@169267 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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