BufferingState::SetMaxRenderingTime was never being called.

Also added a cap to reported max rendering time to prevent
interpolation too far ahead.

Bug=408189

Review URL: https://codereview.chromium.org/786493004

Cr-Commit-Position: refs/heads/master@{#307350}

chromecast/media/cma/pipeline/av_pipeline_impl.cc

@@ -282,6 +282,12 @@ void AvPipelineImpl::ProcessPendingBuffer() {
     }
   }
 
+  if (!pending_buffer_->end_of_stream() && buffering_state_.get()) {
+    base::TimeDelta timestamp = pending_buffer_->timestamp();
+    if (timestamp != ::media::kNoTimestamp())
+      buffering_state_->SetMaxRenderingTime(timestamp);
+  }
+
   MediaComponentDevice::FrameStatus status = media_component_device_->PushFrame(
       decrypt_context,
       pending_buffer_,

chromecast/media/cma/pipeline/media_pipeline_impl.cc

@@ -337,10 +337,16 @@ void MediaPipelineImpl::UpdateMediaTime() {
   if (buffering_controller_) {
     buffering_controller_->SetMediaTime(media_time);
 
+    // Receiving the same time twice in a row means playback isn't moving,
+    // so don't interpolate ahead.
     if (media_time != last_media_time_) {
       max_rendering_time = buffering_controller_->GetMaxRenderingTime();
       if (max_rendering_time == ::media::kNoTimestamp())
         max_rendering_time = media_time;
+
+      // Cap interpolation time to avoid interpolating too far ahead.
+      max_rendering_time =
+          std::min(max_rendering_time, media_time + 2 * kTimeUpdateInterval);
     }
   }