Bug 1041530. Be more careful about contributing opaque areas to the window region. r=mattwoodrow

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extra : rebase_source : 3665198c22b44644a876332a5b6e8a480c64a3f5
Bug 1013054. Don't propagate non-repaint change hints to the canvas frame. r=mattwoodrow

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extra : rebase_source : c5e9613baf7a444dafbb1b9677cf7b4bd5381140
Bug 1042104. Part 1: Cache prerender flag in nsDisplayTransform. r=tn

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extra : rebase_source : 79f39bb1b0d29cc28b4d492fbf6a497f99ec9dac
Bug 1042104. Part 2: Set nsDisplayTransform's visible rect appropriately if we're prerendering it. r=tn

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extra : rebase_source : 20e95312e0b3b17098314647edc1ad9786c46eb9