Cleanup shared memory handling in DesktopCapturer interface.

webrtc/modules/desktop_capture/shared_memory.h

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_SHARED_MEMORY_H_
 #define WEBRTC_MODULES_DESKTOP_CAPTURE_SHARED_MEMORY_H_
 
 #include <stddef.h>
 
 #if defined(WEBRTC_WIN)
 #include <windows.h>
 #endif
 
+#include "webrtc/base/scoped_ptr.h"
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 
 // SharedMemory is a base class for shared memory. It stores all required
 // parameters of the buffer, but doesn't have any logic to allocate or destroy
 // the actual buffer. DesktopCapturer consumers that need to use shared memory
 // for video frames must extend this class with creation and destruction logic
-// specific for the target platform and then implement
-// DesktopCapturer::Delegate::CreateSharedMemory() as appropriate.
+// specific for the target platform and then call
+// DesktopCapturer::SetSharedMemoryFactory().
 class SharedMemory {
  public:
 #if defined(WEBRTC_WIN)
   typedef HANDLE Handle;
   static const Handle kInvalidHandle;
 #else
   typedef int Handle;
   static const Handle kInvalidHandle;
 #endif
 
@@ skipping 14 matching lines @@
 
   void* const data_;
   const size_t size_;
   const Handle handle_;
   const int id_;
 
  private:
   RTC_DISALLOW_COPY_AND_ASSIGN(SharedMemory);
 };
 
+// Interface used to create SharedMemory instances.
+class SharedMemoryFactory {
+ public:
+  SharedMemoryFactory() {}
+  virtual ~SharedMemoryFactory() {}
+
+  virtual rtc::scoped_ptr<SharedMemory> CreateSharedMemory(size_t size) = 0;
+
+ private:
+  RTC_DISALLOW_COPY_AND_ASSIGN(SharedMemoryFactory);
+};
+
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_SHARED_MEMORY_H_