Use newImageSnapshot() to get an image from a Canvas

Source/platform/graphics/BitmapPatternBase.h

Index: Source/platform/graphics/BitmapPatternBase.h
diff --git a/Source/platform/graphics/BitmapPatternBase.h b/Source/platform/graphics/BitmapPatternBase.h
new file mode 100644
index 0000000000000000000000000000000000000000..00d1bbf5c238fbe5af5a0551adee4826ecdd5a0a
--- /dev/null
+++ b/Source/platform/graphics/BitmapPatternBase.h
@@ -0,0 +1,26 @@
+// 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.
+
+#ifndef BitmapPatternBase_h
+#define BitmapPatternBase_h
+
+#include "platform/graphics/Pattern.h"
+
+namespace blink {
+
+class PLATFORM_EXPORT BitmapPatternBase : public Pattern {
+public:
+    BitmapPatternBase(RepeatMode, int64_t externalMemoryAllocated = 0);
+    virtual ~BitmapPatternBase();
+
+    virtual PassRefPtr<SkShader> createShader() OVERRIDE;
+
+protected:
+    virtual SkImageInfo getBitmapInfo() = 0;
+    virtual void drawBitmapToCanvas(SkCanvas&, SkPaint&) = 0;
+};
+
+} // namespace
+
+#endif  /* BitmapPatternBase_h */