Notify HTMLMediaElement when media pipeline init has finished

media/filters/pipeline_controller.cc

Index: media/filters/pipeline_controller.cc
diff --git a/media/filters/pipeline_controller.cc b/media/filters/pipeline_controller.cc
index 2055afb9dc08cdd3a3879434301051a1b84167c8..4bbc3b064053d698137761a016dbf2283e5d954e 100644
--- a/media/filters/pipeline_controller.cc
+++ b/media/filters/pipeline_controller.cc
@@ -12,17 +12,20 @@ namespace media {
 PipelineController::PipelineController(
     Pipeline* pipeline,
     const RendererFactoryCB& renderer_factory_cb,
+    const PipelineStatusCB& start_done_cb,
     const SeekedCB& seeked_cb,
     const SuspendedCB& suspended_cb,
     const PipelineStatusCB& error_cb)
     : pipeline_(pipeline),
       renderer_factory_cb_(renderer_factory_cb),
+      start_done_cb_(start_done_cb),
       seeked_cb_(seeked_cb),
       suspended_cb_(suspended_cb),
       error_cb_(error_cb),
       weak_factory_(this) {
   DCHECK(pipeline_);
   DCHECK(!renderer_factory_cb_.is_null());
+  DCHECK(!start_done_cb.is_null());
   DCHECK(!seeked_cb_.is_null());
   DCHECK(!suspended_cb_.is_null());
   DCHECK(!error_cb_.is_null());
@@ -118,6 +121,10 @@ void PipelineController::OnPipelineStatus(State state,
                                           PipelineStatus pipeline_status) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
+  if (state_ == State::STARTING) {
+    start_done_cb_.Run(pipeline_status);
+  }
+
   if (pipeline_status != PIPELINE_OK) {
     error_cb_.Run(pipeline_status);
     return;