Support for AudioContextOptions latencyHint.

third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.h

Index: third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.h
diff --git a/third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.h b/third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.h
index d96b3eb67a54cb7e6561bc8e47e2df6253a3717e..fae6aee68729d0b6a9df2cd702f5664a325f6e57 100644
--- a/third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.h
+++ b/third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.h
@@ -28,16 +28,20 @@
 
 #include "modules/webaudio/AudioDestinationNode.h"
 #include "platform/audio/AudioDestination.h"
+#include "public/platform/WebAudioLatencyHint.h"

[hongchan, 2016/12/02 17:40:12]

Do we need the actual inclusion here? I think the forward declaration below is
good enough.

[Andrew MacPherson, 2016/12/05 14:12:53]

I believe it's required due to the m_latencyHint member on the type here.

 #include <memory>
 
 namespace blink {
 
 class BaseAudioContext;
 class ExceptionState;
+class WebAudioLatencyHint;
 
 class DefaultAudioDestinationHandler final : public AudioDestinationHandler {
  public:
-  static PassRefPtr<DefaultAudioDestinationHandler> create(AudioNode&);
+  static PassRefPtr<DefaultAudioDestinationHandler> create(
+      AudioNode&,
+      const WebAudioLatencyHint&);
   ~DefaultAudioDestinationHandler() override;
 
   // AudioHandler
@@ -50,22 +54,28 @@ class DefaultAudioDestinationHandler final : public AudioDestinationHandler {
   void startRendering() override;
   void stopRendering() override;
   unsigned long maxChannelCount() const override;
+  double sampleRate() const override;
+  int framesPerBuffer() const override;
 
  private:
-  explicit DefaultAudioDestinationHandler(AudioNode&);
+  explicit DefaultAudioDestinationHandler(AudioNode&,
+                                          const WebAudioLatencyHint&);
   void createDestination();
 
   std::unique_ptr<AudioDestination> m_destination;
   String m_inputDeviceId;
   unsigned m_numberOfInputChannels;
+  const WebAudioLatencyHint m_latencyHint;
 };
 
 class DefaultAudioDestinationNode final : public AudioDestinationNode {
  public:
-  static DefaultAudioDestinationNode* create(BaseAudioContext*);
+  static DefaultAudioDestinationNode* create(BaseAudioContext*,
+                                             const WebAudioLatencyHint&);
 
  private:
-  explicit DefaultAudioDestinationNode(BaseAudioContext&);
+  explicit DefaultAudioDestinationNode(BaseAudioContext&,
+                                       const WebAudioLatencyHint&);
 };
 
 }  // namespace blink