Encrypted Media: Support Audio Decrypt-Only.

media/base/pipeline.cc

Index: media/base/pipeline.cc
diff --git a/media/base/pipeline.cc b/media/base/pipeline.cc
index fd8b902d7f3808bb296fae869dde8e0aefee8303..e7977fb9aa93ea0e94a9e8d678df31bcb2ae796a 100644
--- a/media/base/pipeline.cc
+++ b/media/base/pipeline.cc
@@ -106,7 +106,8 @@ void Pipeline::Start(scoped_ptr<FilterCollection> collection,
                      const PipelineStatusCB& ended_cb,
                      const PipelineStatusCB& error_cb,
                      const PipelineStatusCB& seek_cb,
-                     const BufferingStateCB& buffering_state_cb) {
+                     const BufferingStateCB& buffering_state_cb,
+                     const SetDecryptorReadyCB& set_decryptor_ready_cb) {
   base::AutoLock auto_lock(lock_);
   CHECK(!running_) << "Media pipeline is already running";
   DCHECK(!buffering_state_cb.is_null());
@@ -114,7 +115,7 @@ void Pipeline::Start(scoped_ptr<FilterCollection> collection,
   running_ = true;
   message_loop_->PostTask(FROM_HERE, base::Bind(
       &Pipeline::StartTask, this, base::Passed(&collection),
-      ended_cb, error_cb, seek_cb, buffering_state_cb));
+      ended_cb, error_cb, seek_cb, buffering_state_cb, set_decryptor_ready_cb));
 }
 
 void Pipeline::Stop(const base::Closure& stop_cb) {
@@ -697,7 +698,8 @@ void Pipeline::StartTask(scoped_ptr<FilterCollection> filter_collection,
                          const PipelineStatusCB& ended_cb,
                          const PipelineStatusCB& error_cb,
                          const PipelineStatusCB& seek_cb,
-                         const BufferingStateCB& buffering_state_cb) {
+                         const BufferingStateCB& buffering_state_cb,
+                         const SetDecryptorReadyCB& set_decryptor_ready_cb) {
   DCHECK(message_loop_->BelongsToCurrentThread());
   CHECK_EQ(kCreated, state_)
       << "Media pipeline cannot be started more than once";
@@ -707,6 +709,7 @@ void Pipeline::StartTask(scoped_ptr<FilterCollection> filter_collection,
   error_cb_ = error_cb;
   seek_cb_ = seek_cb;
   buffering_state_cb_ = buffering_state_cb;
+  set_decryptor_ready_cb_ = set_decryptor_ready_cb;
 
   StateTransitionTask(PIPELINE_OK);
 }
@@ -889,6 +892,7 @@ void Pipeline::InitializeAudioRenderer(const PipelineStatusCB& done_cb) {
   audio_renderer_->Initialize(
       stream,
       *filter_collection_->GetAudioDecoders(),
+      set_decryptor_ready_cb_,
       done_cb,
       base::Bind(&Pipeline::OnUpdateStatistics, this),
       base::Bind(&Pipeline::OnAudioUnderflow, this),