Implementation of 'AudioContext.getOutputTimestamp' method

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

Index: third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.h
diff --git a/third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.h b/third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.h
index 942b7ff67613c808866669403c498570b0da65a9..d082cebcd0024d9051017923fcbed87a638e808a 100644
--- a/third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.h
+++ b/third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.h
@@ -204,7 +204,7 @@ public:
     void notifySourceNodeFinishedProcessing(AudioHandler*);
 
     // Called at the start of each render quantum.
-    void handlePreRenderTasks();
+    void handlePreRenderTasks(const WebAudioTimestamp&);
 
     // Called at the end of each render quantum.
     void handlePostRenderTasks();
@@ -267,6 +267,9 @@ public:
     // a histogram.
     void recordUserGestureState();
 
+    // Gets the audio timestamp of the currently audiable signal.
+    virtual void getOutputTimestamp(AudioTimestamp&) {}
+
 protected:
     explicit AbstractAudioContext(Document*);
     AbstractAudioContext(Document*, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate);
@@ -296,6 +299,8 @@ protected:
 
     void rejectPendingDecodeAudioDataResolvers();
 
+    WebAudioTimestamp outputTimestamp();
+
 private:
     bool m_isCleared;
     void clear();
@@ -375,6 +380,9 @@ private:
     // This is considering 32 is large enough for multiple channels audio.
     // It is somewhat arbitrary and could be increased if necessary.
     enum { MaxNumberOfChannels = 32 };
+
+    // Output audio stream timestamp.
+    WebAudioTimestamp m_outputTimestamp;
 };
 
 } // namespace blink