Expose WebThread rendering only when AudioWorklet flag is enabled

third_party/WebKit/Source/platform/audio/AudioDestination.h

Index: third_party/WebKit/Source/platform/audio/AudioDestination.h
diff --git a/third_party/WebKit/Source/platform/audio/AudioDestination.h b/third_party/WebKit/Source/platform/audio/AudioDestination.h
index bbf8426212d2fae5f7245f2588df59ab38a0722f..5664560b0c482f34d9202d09afcc427e2ae6c882 100644
--- a/third_party/WebKit/Source/platform/audio/AudioDestination.h
+++ b/third_party/WebKit/Source/platform/audio/AudioDestination.h
@@ -74,13 +74,12 @@ class PLATFORM_EXPORT AudioDestination : public WebAudioDevice::RenderCallback {
               double delay_timestamp,
               size_t prior_frames_skipped) override;
 
-  // The actual render request to the WebAudio destination node. This triggers
-  // the WebAudio rendering pipe line on the web thread.
-  void RequestRenderOnWebThread(size_t frames_requested,
-                                size_t frames_to_render,
-                                double delay,
-                                double delay_timestamp,
-                                size_t prior_frames_skipped);
+  // The actual render request to the WebAudio destination node.
+  void RequestRender(size_t frames_requested,
+                     size_t frames_to_render,
+                     double delay,
+                     double delay_timestamp,
+                     size_t prior_frames_skipped);
 
   virtual void Start();
   virtual void Stop();
@@ -96,6 +95,8 @@ class PLATFORM_EXPORT AudioDestination : public WebAudioDevice::RenderCallback {
   // hardware.
   int FramesPerBuffer() const;
 
+  bool IsAudioWorkletEnabled() const { return is_audio_worklet_enabled; }
+
   // The information from the actual audio hardware. (via Platform::current)
   static float HardwareSampleRate();
   static unsigned long MaxChannelCount();
@@ -106,8 +107,6 @@ class PLATFORM_EXPORT AudioDestination : public WebAudioDevice::RenderCallback {
 
   size_t HardwareBufferSize();
 
-  bool IsRenderingThread();
-
   // Accessed by the main thread.
   std::unique_ptr<WebAudioDevice> web_audio_device_;
   const unsigned number_of_output_channels_;
@@ -134,6 +133,9 @@ class PLATFORM_EXPORT AudioDestination : public WebAudioDevice::RenderCallback {
 
   // Accessed by rendering thread.
   size_t frames_elapsed_;
+
+  // For signle thread rendering pipe line.

[Raymond Toy, 2017/05/15 17:42:24]

"signle"

And the comment doesn't really explain what is_audio_worklet_enabled seems to
imply.  Fix the comment or the variable name.

+  const bool is_audio_worklet_enabled;
 };
 
 }  // namespace blink