Canvas capture from inactive tab

content/renderer/media/canvas_capture_handler.h

 // Copyright 2015 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_RENDERER_MEDIA_CANVAS_CAPTURE_HANDLER_H_
 #define CONTENT_RENDERER_MEDIA_CANVAS_CAPTURE_HANDLER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "content/common/content_export.h"
+#include "content/renderer/render_view_impl.h"
 #include "media/base/video_capturer_source.h"
 #include "media/base/video_frame_pool.h"
 #include "third_party/WebKit/public/platform/WebCanvasCaptureHandler.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
 #include "third_party/skia/include/core/SkImage.h"
 
 namespace content {
 
 // CanvasCaptureHandler acts as the link between Blink side HTMLCanvasElement
@@ skipping 47 matching lines @@
       blink::WebMediaStreamTrack* web_track);
 
   // Implementation VideoCapturerSource that is owned by Blink and delegates
   // the Start/Stop calls to CanvasCaptureHandler.
   class VideoCapturerSource;
 
   // Object that does all the work of running |new_frame_callback_|.
   // Destroyed on |frame_callback_task_runner_| after the class is destroyed.
   class CanvasCaptureHandlerDelegate;
 
+  RenderViewImpl* render_view_;
+
   media::VideoCaptureFormat capture_format_;
   bool ask_for_new_frame_;
 
   const blink::WebSize size_;
   gfx::Size last_size;
   std::vector<uint8_t> temp_data_;
   size_t row_bytes_;
   SkImageInfo image_info_;
   media::VideoFramePool frame_pool_;
 
+  // Keeps track of the capture count increment. Safe to use a boolean
+  // since the methods are single threaded.
+  bool capturer_count_incremented_;
+
   const scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
   scoped_ptr<CanvasCaptureHandlerDelegate> delegate_;
   // Bound to the main render thread.
   base::ThreadChecker thread_checker_;
   base::WeakPtrFactory<CanvasCaptureHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CanvasCaptureHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_CANVAS_CAPTURE_HANDLER_H_