[DevTools] Move PNG encoding from UI to worker thread.

content/browser/devtools/protocol/page_handler.h

 // 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 CONTENT_BROWSER_DEVTOOLS_PROTOCOL_PAGE_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_PAGE_HANDLER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 72 matching lines @@
       const std::string& security_origin,
       scoped_refptr<DevToolsProtocol::Command> command);
 
   Response SetColorPickerEnabled(bool enabled);
 
  private:
   void UpdateTouchEventEmulationState();
 
   void NotifyScreencastVisibility(bool visible);
   void InnerSwapCompositorFrame();
-  void ScreencastFrameCaptured(const std::string& format,
-                               int quality,
-                               const cc::CompositorFrameMetadata& metadata,
+  void ScreencastFrameCaptured(const cc::CompositorFrameMetadata& metadata,
                                const SkBitmap& bitmap,
                                ReadbackResponse response);
+  void ScreencastFrameEncoded(const cc::CompositorFrameMetadata& metadata,
+                              const std::string& data);
 
   void ScreenshotCaptured(
       scoped_refptr<DevToolsProtocol::Command> command,
       const unsigned char* png_data,
       size_t png_size);
 
   void OnColorPicked(int r, int g, int b, int a);
 
   void QueryUsageAndQuotaCompleted(
       scoped_refptr<DevToolsProtocol::Command> command,
@@ skipping 21 matching lines @@
   base::WeakPtrFactory<PageHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PageHandler);
 };
 
 }  // namespace page
 }  // namespace devtools
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_PAGE_HANDLER_H_