Fix crash in OffscreenCanvas frame dispatch.

Crash happens when a the frame to be presents fails to be uploaded
to a texture (e.g. exceeds max texture size)

BUG=793651

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I7fd6373cbc6bd4d070de8fd0f4731068846242d1
Reviewed-on: https://chromium-review.googlesource.com/820159Reviewed-by: Olivia Lai <xlai@chromium.org>
Commit-Queue: Justin Novosad <junov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523490}

third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.cpp

@@ -205,10 +205,13 @@ void OffscreenCanvasFrameDispatcherImpl::DispatchFrame(
     if (SharedGpuContext::IsGpuCompositingEnabled()) {
       // Case 3: canvas is not gpu-accelerated, but compositor is.
       commit_type = kCommitSoftwareCanvasGPUCompositing;
+      scoped_refptr<StaticBitmapImage> accelerated_image =
+          image->MakeAccelerated(SharedGpuContext::ContextProviderWrapper());
+      if (!accelerated_image)
+        return;
       offscreen_canvas_resource_provider_
-          ->SetTransferableResourceToStaticBitmapImage(
-              resource, image->MakeAccelerated(
-                            SharedGpuContext::ContextProviderWrapper()));
+          ->SetTransferableResourceToStaticBitmapImage(resource,
+                                                       accelerated_image);
     } else {
       // Case 4: both canvas and compositor are not gpu accelerated.
       commit_type = kCommitSoftwareCanvasSoftwareCompositing;