[Webkit-unassigned] [Bug 104950] New: [Chromium] Enable composited scrolling for frames

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=104950

           Summary: [Chromium] Enable composited scrolling for frames
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: wangxianzhu at chromium.org
                CC: jamesr at chromium.org, klobag at chromium.org,
                    vollick at chromium.org, skyostil at chromium.org


When enableAcceleratedCompositingForScrollableFrames, we also need to setScrollable(true) to enable composited scrolling for iframes. Otherwise Chromium compositor will still use the scroll layer of the main page and fall back to slow scrolling path because of the nonFastScrollableRegion (which eventually should not include iframes and overflow:scroll areas) of the main scroll layer. The patch to this bug will only address setScrollable, not nonFastScrollableRegion.

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