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 49caf5b8215cf03622a04e9a673bce76081d8355..a98f579e174d56735de23419ad534c9c373b7038 100644
--- a/media/base/bitstream_buffer.cc
+++ b/media/base/bitstream_buffer.cc
@@ -9,18 +9,29 @@ namespace media {
 BitstreamBuffer::BitstreamBuffer(int32_t 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_t id,
+                                 base::SharedMemoryHandle handle,
+                                 size_t size,
+                                 off_t offset)
+    : BitstreamBuffer(id, handle, size, offset, kNoTimestamp()) {}
+
+BitstreamBuffer::BitstreamBuffer(int32_t id,
+                                 base::SharedMemoryHandle handle,
+                                 size_t size,
+                                 base::TimeDelta presentation_timestamp)
+    : BitstreamBuffer(id, handle, size, 0, presentation_timestamp) {}
 
 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() {}