Add set_timestamp to cma's DecoderBufferBase

I'm currently refactoring some code that uses DecoderBuffer to use
DecoderBufferBase instead (so it can run in a cma backend).  It also
depends on DecoderBuffer::set_timestamp, so we need an equivalent
in DecoderBufferBase.

BUG=

Review URL: https://codereview.chromium.org/1145163005

Cr-Commit-Position: refs/heads/master@{#333138}

chromecast/media/cma/base/decoder_buffer_adapter.cc

@@ -31,6 +31,10 @@ base::TimeDelta DecoderBufferAdapter::timestamp() const {
   return buffer_->timestamp();
 }
 
+void DecoderBufferAdapter::set_timestamp(const base::TimeDelta& timestamp) {
+  buffer_->set_timestamp(timestamp);
+}
+
 const uint8* DecoderBufferAdapter::data() const {
   return buffer_->data();
 }

chromecast/media/cma/base/decoder_buffer_adapter.h

@@ -30,6 +30,7 @@ class DecoderBufferAdapter : public DecoderBufferBase {
   // DecoderBufferBase implementation.
   StreamId stream_id() const override;
   base::TimeDelta timestamp() const override;
+  void set_timestamp(const base::TimeDelta& timestamp) override;
   const uint8* data() const override;
   uint8* writable_data() const override;
   size_t data_size() const override;

chromecast/media/cma/base/decoder_buffer_base.h

@@ -33,6 +33,9 @@ class DecoderBufferBase
   // Returns the PTS of the frame.
   virtual base::TimeDelta timestamp() const = 0;
 
+  // Sets the PTS of the frame.
+  virtual void set_timestamp(const base::TimeDelta& timestamp) = 0;
+
   // Gets the frame data.
   virtual const uint8* data() const = 0;
   virtual uint8* writable_data() const = 0;

chromecast/media/cma/ipc_streamer/decoder_buffer_base_marshaller.cc

@@ -26,6 +26,7 @@ class DecoderBufferFromMsg : public DecoderBufferBase {
   // DecoderBufferBase implementation.
   StreamId stream_id() const override;
   base::TimeDelta timestamp() const override;
+  void set_timestamp(const base::TimeDelta& timestamp) override;
   const uint8* data() const override;
   uint8* writable_data() const override;
   size_t data_size() const override;
@@ -114,6 +115,10 @@ base::TimeDelta DecoderBufferFromMsg::timestamp() const {
   return pts_;
 }
 
+void DecoderBufferFromMsg::set_timestamp(const base::TimeDelta& timestamp) {
+  pts_ = timestamp;
+}
+
 const uint8* DecoderBufferFromMsg::data() const {
   CHECK(msg_->IsSerializedMsgAvailable());
   return data_;

chromecast/media/cma/pipeline/decrypt_util.cc

@@ -24,6 +24,7 @@ class DecoderBufferClear : public DecoderBufferBase {
   // DecoderBufferBase implementation.
   StreamId stream_id() const override;
   base::TimeDelta timestamp() const override;
+  void set_timestamp(const base::TimeDelta& timestamp) override;
   const uint8* data() const override;
   uint8* writable_data() const override;
   size_t data_size() const override;
@@ -54,6 +55,10 @@ base::TimeDelta DecoderBufferClear::timestamp() const {
   return buffer_->timestamp();
 }
 
+void DecoderBufferClear::set_timestamp(const base::TimeDelta& timestamp) {
+  buffer_->set_timestamp(timestamp);
+}
+
 const uint8* DecoderBufferClear::data() const {
   return buffer_->data();
 }