[Chromecast] Don't push buffers after the backend has been stopped

chromecast/media/cma/pipeline/av_pipeline_impl.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromecast/media/cma/pipeline/av_pipeline_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 259 matching lines @@
 }
 
 void AvPipelineImpl::OnBufferDecrypted(
     std::unique_ptr<DecryptContextImpl> decrypt_context,
     scoped_refptr<DecoderBufferBase> buffer,
     bool success) {
   if (!success) {
     LOG(WARNING) << "Can't decrypt with decrypt_context";
     buffer->set_decrypt_context(std::move(decrypt_context));
   }
+
+  if (!enable_feeding_)
+    return;
+
   pending_buffer_ = buffer;
   PushPendingBuffer();
 }
 
 void AvPipelineImpl::OnPushBufferComplete(BufferStatus status) {
   DCHECK(thread_checker_.CalledOnValidThread());
   pushed_buffer_ = nullptr;
   if (status == MediaPipelineBackend::kBufferFailed) {
     LOG(WARNING) << "AvPipelineImpl: PushFrame failed";
     OnDecoderError();
@@ skipping 103 matching lines @@
       }
     }
 
     // The frame is playable: remove it from the list of non playable frames.
     non_playable_frames_.pop_front();
   }
 }
 
 }  // namespace media
 }  // namespace chromecast