Add offset support to BitstreamBuffer.

media/base/bitstream_buffer.cc

Index: media/base/bitstream_buffer.cc
diff --git a/media/base/bitstream_buffer.cc b/media/base/bitstream_buffer.cc
index 5491bcb2de1ac13f0c81a3ee80b95a1f69e6103f..b19fe8b7cae50233cf1d4c8733c6a6b576d5630e 100644
--- a/media/base/bitstream_buffer.cc
+++ b/media/base/bitstream_buffer.cc
@@ -9,18 +9,29 @@ namespace media {
 BitstreamBuffer::BitstreamBuffer(int32 id,
                                  base::SharedMemoryHandle handle,
                                  size_t size)
-    : id_(id),
-      handle_(handle),
-      size_(size),
-      presentation_timestamp_(kNoTimestamp()) {}
+    : BitstreamBuffer(id, handle, size, 0, kNoTimestamp()) {}
+
+BitstreamBuffer::BitstreamBuffer(int32 id,
+                                 base::SharedMemoryHandle handle,
+                                 size_t size,
+                                 off_t offset)
+    : BitstreamBuffer(id, handle, size, offset, kNoTimestamp()) {}
+
+BitstreamBuffer::BitstreamBuffer(int32 id,
+                                 base::SharedMemoryHandle handle,
+                                 size_t size,
+                                 base::TimeDelta presentation_timestamp)
+    : BitstreamBuffer(id, handle, size, 0, presentation_timestamp) {}
 
 BitstreamBuffer::BitstreamBuffer(int32 id,
                                  base::SharedMemoryHandle handle,
                                  size_t size,
+                                 off_t offset,
                                  base::TimeDelta presentation_timestamp)
     : id_(id),
       handle_(handle),
       size_(size),
+      offset_(offset),
       presentation_timestamp_(presentation_timestamp) {}
 
 BitstreamBuffer::~BitstreamBuffer() {}