[Webkit-unassigned] [Bug 191577] [cairo] BackingStore::incorporateUpdate should use CompositeCopy to support drawsBackground=false in general Cairo ports

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191577

--- Comment #2 from Tomoki Imai <Tomoki.Imai at sony.com> ---
Created attachment 354645

  --> https://bugs.webkit.org/attachment.cgi?id=354645&action=review

Use CompositeCopy to update bitmap to overwrite existing surface

We should set graphicsContext.setCompositeOperation(WebCore::CompositeCopy) before updating surface.
We should overwrite existing surface by the source even if it contains non opaque parts.

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