Add offset support to BitstreamBuffer.

content/common/gpu/media/android_video_encode_accelerator.cc

Index: content/common/gpu/media/android_video_encode_accelerator.cc
diff --git a/content/common/gpu/media/android_video_encode_accelerator.cc b/content/common/gpu/media/android_video_encode_accelerator.cc
index e439203fc28f3b99b97b875d362b12ba967eae88..55eedce621532b655a61310ab788826d70acfc04 100644
--- a/content/common/gpu/media/android_video_encode_accelerator.cc
+++ b/content/common/gpu/media/android_video_encode_accelerator.cc
@@ -428,11 +428,9 @@ void AndroidVideoEncodeAccelerator::DequeueOutput() {
 
   media::BitstreamBuffer bitstream_buffer = available_bitstream_buffers_.back();
   available_bitstream_buffers_.pop_back();
-  scoped_ptr<base::SharedMemory> shm(
-      new base::SharedMemory(bitstream_buffer.handle(), false));
-  RETURN_ON_FAILURE(shm->Map(bitstream_buffer.size()),
-                    "Failed to map SHM",
-                    kPlatformFailureError);
+  scoped_ptr<SharedMemoryRegion> shm(
+      new SharedMemoryRegion(bitstream_buffer, false));
+  RETURN_ON_FAILURE(shm->Map(), "Failed to map SHM", kPlatformFailureError);
   RETURN_ON_FAILURE(size <= shm->mapped_size(),
                     "Encoded buffer too large: " << size << ">"
                                                  << shm->mapped_size(),