[Webkit-unassigned] [Bug 100797] New: Coordinated Graphics: Manage the lifecycle of shareable surfaces precisely.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=100797

           Summary: Coordinated Graphics: Manage the lifecycle of
                    shareable surfaces precisely.
           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


This patch makes UpdateAtlas manage the lifecycle of shareable surfaces
containing the updates in the way how CoordinatedTile manages the lifecycle of
tiles. Currently, UI Process creates the shareable surface when receiving an
UpdateTileForLayer message, but there is no exact point to remove the shareable
surface. Now, we introduce new two messages to handle the lifecycle:
CreateUpdateAtlas and RemoveUpdateAtlas.

This patch gives us two benefits.
1. Reduce file and mmap operations. Web Process does not need to duplicate a
file handle every tile update. UI Proces does not need to create a
ShareableSurface every UpdateTileForLayer message.
2. Save memory. We can remove a ShareableSurface in UI Process when UpdateAtlas
in Web Process is removed.

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