Added a non-null check in the constructor of StaticBitmapImage

Source/platform/graphics/StaticBitmapImage.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "platform/graphics/StaticBitmapImage.h"
 
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/ImageObserver.h"
 #include "platform/graphics/skia/NativeImageSkia.h"
 #include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/core/SkShader.h"
 
 namespace blink {
 
 PassRefPtr<Image> StaticBitmapImage::create(PassRefPtr<SkImage> image)
 {
     return adoptRef(new StaticBitmapImage(image));
 }
 
 StaticBitmapImage::StaticBitmapImage(PassRefPtr<SkImage> image) : m_image(image)
 {
+    ASSERT(m_image);
 }
 
 StaticBitmapImage::~StaticBitmapImage() { }
 
 IntSize StaticBitmapImage::size() const
 {
     return IntSize(m_image->width(), m_image->height());
 }
 
 bool StaticBitmapImage::currentFrameKnownToBeOpaque()
@@ skipping 21 matching lines @@
 
     SkCanvas* canvas = ctx->canvas();
 
     canvas->drawImageRect(m_image.get(), &srcSkRect, dstSkRect, &paint);
 
     if (ImageObserver* observer = imageObserver())
         observer->didDraw(this);
 }
 
 }