Add rendering fast path for when playing a display list canvas at 1:1 scale
Add rendering fast path for when playing a display list canvas at 1:1 scale

This patch modifies GraphicsContext::drawPicture to make it
avoid the use of image filters for presenting canvas
contents, and just use a plain save layer when drawing
contents at 1:1 pixel scale.

BUG=386601

Review URL: https://codereview.chromium.org/662673002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@183836 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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