Add offset support to BitstreamBuffer.

content/common/gpu/media/android_video_decode_accelerator.cc

Index: content/common/gpu/media/android_video_decode_accelerator.cc
diff --git a/content/common/gpu/media/android_video_decode_accelerator.cc b/content/common/gpu/media/android_video_decode_accelerator.cc
index 00e1bb67856e14163ea5da84a6d04a37607335de..9119400014ac8d774f427d19acf52a92c9939347 100644
--- a/content/common/gpu/media/android_video_decode_accelerator.cc
+++ b/content/common/gpu/media/android_video_decode_accelerator.cc
@@ -204,10 +204,10 @@ void AndroidVideoDecodeAccelerator::QueueInput() {
     return;
   }
 
-  scoped_ptr<base::SharedMemory> shm(
-      new base::SharedMemory(bitstream_buffer.handle(), true));
-  RETURN_ON_FAILURE(this, shm->Map(bitstream_buffer.size()),
-                    "Failed to SharedMemory::Map()", UNREADABLE_INPUT);
+  scoped_ptr<SharedMemoryRegion> shm(
+      new SharedMemoryRegion(bitstream_buffer, true));
+  RETURN_ON_FAILURE(this, shm->Map(), "Failed to SharedMemoryRegion::Map()",
+                    UNREADABLE_INPUT);
 
   const base::TimeDelta presentation_timestamp =
       bitstream_buffer.presentation_timestamp();