Check If ImageBuffer is allocated before proceeding.

Source/platform/graphics/GraphicsContextTest.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 225 matching lines @@
     // not be marked opaque.
 
     context.setCompositeOperation(CompositeSourceOver);
     context.beginTransparencyLayer(1);
     context.fillRect(FloatRect(10, 10, 10, 10), opaque, CompositeSourceOver);
 
     context.setCompositeOperation(CompositeDestinationIn);
     context.beginTransparencyLayer(1);
 
     OwnPtr<ImageBuffer> alphaImage = ImageBuffer::create(IntSize(100, 100));
+    EXPECT_FALSE(!alphaImage);
     alphaImage->context()->fillRect(IntRect(0, 0, 100, 100), alpha);
 
     context.setCompositeOperation(CompositeSourceOver);
     context.drawImageBuffer(alphaImage.get(), FloatRect(10, 10, 10, 10));
 
     context.endLayer();
     context.endLayer();
 
     EXPECT_EQ_RECT(IntRect(), context.opaqueRegion().asRect());
     EXPECT_PIXELS_MATCH_EXACT(bitmap, context.opaqueRegion().asRect());
@@ skipping 17 matching lines @@
     // not be marked opaque.
 
     context.setCompositeOperation(CompositeSourceOver);
     context.beginTransparencyLayer(1);
     context.fillRect(FloatRect(10, 10, 10, 10), opaque, CompositeSourceOver);
 
     context.setCompositeOperation(CompositeDestinationIn);
     context.beginTransparencyLayer(1);
 
     OwnPtr<ImageBuffer> alphaImage = ImageBuffer::create(IntSize(100, 100));
+    EXPECT_FALSE(!alphaImage);
     alphaImage->context()->fillRect(IntRect(0, 0, 100, 100), alpha);
 
     context.setCompositeOperation(CompositeSourceOver);
     context.drawImageBuffer(alphaImage.get(), FloatRect(10, 10, 10, 10));
 
     // We can't have an opaque mask actually, but we can pretend here like it would look if we did.
     context.fillRect(FloatRect(12, 12, 3, 3), opaque, CompositeSourceOver);
 
     context.endLayer();
     context.endLayer();
@@ skipping 887 matching lines @@
     // endRecording finally makes the picture accessible
     RefPtr<DisplayList> dl = context.endRecording();
     SkPicture* pic = dl->picture();
     EXPECT_TRUE(pic);
     EXPECT_EQ(1, pic->getRefCnt());
 
     context.endRecording();
 }
 
 } // namespace