DevTools: Add snapshot command log on the frontend.

Source/platform/graphics/GraphicsContextRecorder.h

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 31 matching lines @@
 
 class PLATFORM_EXPORT GraphicsContextSnapshot : public RefCounted<GraphicsContextSnapshot> {
 WTF_MAKE_NONCOPYABLE(GraphicsContextSnapshot);
 public:
     typedef Vector<Vector<double> > Timings;
 
     static PassRefPtr<GraphicsContextSnapshot> load(const char*, size_t);
 
     PassOwnPtr<ImageBuffer> replay(unsigned fromStep = 0, unsigned toStep = 0) const;
     PassOwnPtr<Timings> profile(unsigned minIterations, double minDuration) const;
-    PassRefPtr<JSONArray> snapshotCommandLog() const;
+    PassRefPtr<JSONArray> snapshotCommandLog(unsigned fromStep = 0, unsigned toStep = 0) const;
 
 private:
     friend class GraphicsContextRecorder;
     GraphicsContextSnapshot(PassRefPtr<SkPicture>, bool isCerteainlyOpaque);
 
     PassOwnPtr<ImageBuffer> createImageBuffer() const;
 
     RefPtr<SkPicture> m_picture;
     bool m_isCertainlyOpaque;
 };
 
 class PLATFORM_EXPORT GraphicsContextRecorder {
 WTF_MAKE_NONCOPYABLE(GraphicsContextRecorder);
 public:
     GraphicsContextRecorder() { }
     GraphicsContext* record(const IntSize&, bool isCertainlyOpaque);
     PassRefPtr<GraphicsContextSnapshot> stop();
 
 private:
     RefPtr<SkPicture> m_picture;
     OwnPtr<GraphicsContext> m_context;
     OwnPtr<SkPictureRecorder> m_recorder;
     bool m_isCertainlyOpaque;
 };
 
 }
 
 #endif // GraphicsContextRecorder_h