[Webkit-unassigned] [Bug 219623] New: [GPU Process] Ensure the backend of ImageBuffer is created before getting its handle

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219623

            Bug ID: 219623
           Summary: [GPU Process] Ensure the backend of ImageBuffer is
                    created before getting its handle
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com
                CC: dino at apple.com

In r270458 and in RemoteLayerBackingStore::encode(), casting the ImageBuffer and calling the overriding createImageBufferBackendHandle() of the superclass was replaced by casting the backend() and calling its createImageBufferBackendHandle() directly.

This may lead to crash if the backend was not created when createImageBufferBackendHandle() is called. The createImageBufferBackendHandle() of the ImageBuffer superclass calls ensureBackendCreated() before calling its createImageBufferBackendHandle().

So we need to replace to call ImageBuffer::backend() to ImageBuffer::ensureBackendCreated().

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