Add methods for telling V8 how much memory audio/video is using.

media/filters/audio_renderer_algorithm.cc

Index: media/filters/audio_renderer_algorithm.cc
diff --git a/media/filters/audio_renderer_algorithm.cc b/media/filters/audio_renderer_algorithm.cc
index a3701245a308e688c098975ab46a9cf893016926..6d2e5f9ba6b262331b83ea0597dde06a5a047594 100644
--- a/media/filters/audio_renderer_algorithm.cc
+++ b/media/filters/audio_renderer_algorithm.cc
@@ -223,6 +223,10 @@ void AudioRendererAlgorithm::IncreaseQueueCapacity() {
   capacity_ = std::min(2 * capacity_, max_capacity);
 }
 
+int64_t AudioRendererAlgorithm::GetMemoryUsage() const {
+  return audio_buffer_.frames() * channels_ * sizeof(float);
+}
+
 bool AudioRendererAlgorithm::CanPerformWsola() const {
   const int search_block_size = num_candidate_blocks_ + (ola_window_size_ - 1);
   const int frames = audio_buffer_.frames();