Use webrtc::DesktopCapturer for screen capturer implementation.

media/video/capture/screen/differ.h

 // Copyright (c) 2012 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 MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_H_
 #define MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/media_export.h"
-#include "third_party/skia/include/core/SkRegion.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_region.h"
 
 namespace media {
 
 typedef uint8 DiffInfo;
 
-// TODO: Simplify differ now that we are working with SkRegions.
+// TODO: Simplify differ now that we are working with webrtc::DesktopRegion.
 // diff_info_ should no longer be needed, as we can put our data directly into
 // the region that we are calculating.
 // http://crbug.com/92379
 // TODO(sergeyu): Rename this class to something more sensible, e.g.
 // ScreenCaptureFrameDifferencer.
 class MEDIA_EXPORT Differ {
  public:
   // Create a differ that operates on bitmaps with the specified width, height
   // and bytes_per_pixel.
   Differ(int width, int height, int bytes_per_pixel, int stride);
   ~Differ();
 
   int width() { return width_; }
   int height() { return height_; }
   int bytes_per_pixel() { return bytes_per_pixel_; }
   int bytes_per_row() { return bytes_per_row_; }
 
   // Given the previous and current screen buffer, calculate the dirty region
   // that encloses all of the changed pixels in the new screen.
   void CalcDirtyRegion(const void* prev_buffer, const void* curr_buffer,
-                       SkRegion* region);
+                       webrtc::DesktopRegion* region);
 
  private:
   // Allow tests to access our private parts.
   friend class DifferTest;
 
   // Identify all of the blocks that contain changed pixels.
   void MarkDirtyBlocks(const void* prev_buffer, const void* curr_buffer);
 
   // After the dirty blocks have been identified, this routine merges adjacent
   // blocks into a region.
   // The goal is to minimize the region that covers the dirty blocks.
-  void MergeBlocks(SkRegion* region);
+  void MergeBlocks(webrtc::DesktopRegion* region);
 
   // Check for diffs in upper-left portion of the block. The size of the portion
   // to check is specified by the |width| and |height| values.
   // Note that if we force the capturer to always return images whose width and
   // height are multiples of kBlockSize, then this will never be called.
   DiffInfo DiffPartialBlock(const uint8* prev_buffer, const uint8* curr_buffer,
                             int stride, int width, int height);
 
   // Dimensions of screen.
   int width_;
@@ skipping 13 matching lines @@
   int diff_info_width_;
   int diff_info_height_;
   int diff_info_size_;
 
   DISALLOW_COPY_AND_ASSIGN(Differ);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_H_