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 3378170c2172fd9937d557a061a4fa7ec121caaa..5a1907db25d531b46ec5ab50a1603dbc29476d2b 100644
--- a/media/base/bitstream_buffer.cc
+++ b/media/base/bitstream_buffer.cc
@@ -7,23 +7,17 @@
 namespace media {
 
 BitstreamBuffer::BitstreamBuffer()
-    : id_(-1), size_(0), presentation_timestamp_(kNoTimestamp()) {}
-
-BitstreamBuffer::BitstreamBuffer(int32_t id,
-                                 base::SharedMemoryHandle handle,
-                                 size_t size)
-    : id_(id),
-      handle_(handle),
-      size_(size),
-      presentation_timestamp_(kNoTimestamp()) {}
+    : BitstreamBuffer(-1, base::SharedMemoryHandle(), 0) {}
 
 BitstreamBuffer::BitstreamBuffer(int32_t 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(const BitstreamBuffer& other) = default;