Merge 94982 - [chromium] Prevent a crash when tearing down an ImageBuffer that was not successfu...

Source/WebCore/platform/graphics/skia/ImageBufferSkia.cpp

 /*
  * Copyright (c) 2008, Google Inc. All rights reserved.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
@@ skipping 98 matching lines @@
                 }
             }
         }
     }
 
     success = true;
 }
 
 ImageBuffer::~ImageBuffer()
 {
-    // This is so that the SkGpuDevice destructor has the correct context.
-    m_context->platformContext()->makeGrContextCurrent();
+    if (m_context && m_context->platformContext()) {
+        // This is so that the SkGpuDevice destructor has the correct context.
+        m_context->platformContext()->makeGrContextCurrent();
+    }
 }
 
 GraphicsContext* ImageBuffer::context() const
 {
     return m_context.get();
 }
 
 size_t ImageBuffer::dataSize() const
 {
     return m_size.width() * m_size.height() * 4;
@@ skipping 272 matching lines @@
     SkDevice* device = context()->platformContext()->canvas()->getDevice();
     return ImageToDataURL(device->accessBitmap(false), mimeType, quality);
 }
 
 String ImageDataToDataURL(const ImageData& source, const String& mimeType, const double* quality)
 {
     return ImageToDataURL(source, mimeType, quality);
 }
 
 } // namespace WebCore