[Webkit-unassigned] [Bug 104347] New: Coordinated Graphics: Remove the dependency of WebCoordinatedSurface::Handle from Coordinated Graphics.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=104347

           Summary: Coordinated Graphics: Remove the dependency of
                    WebCoordinatedSurface::Handle from Coordinated
                    Graphics.
           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: luxtella at company100.net


It is a preparation patch for Threaded Coordinated Graphics on WK1.

Currently, UpdateAtlas and CoordinatedImageBacking use WebCoordinatedSurface::Handle, but WebCoordinatedSurface::Handle can be used only IPC-based Coordinated Graphics.
So this patch removes the dependency of WebCoordinatedSurface::Handle from UpdateAtlas and CoordinatedImageBacking.

The constructor of WebCoordinatedSurface creates a handle implicitly and then destroys the handle as soon as sending the handle to UI Process.
External class cannot create WebCoordinatedSurface::Handle anymore, because we don't have the requirement of creating many handles.

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