Implementation of 'AudioContext.getOutputTimestamp' method

third_party/WebKit/public/platform/WebAudioDevice.h

Index: third_party/WebKit/public/platform/WebAudioDevice.h
diff --git a/third_party/WebKit/public/platform/WebAudioDevice.h b/third_party/WebKit/public/platform/WebAudioDevice.h
index d27483bc32a9c5010a3cef706acba13ba0082679..ae72e237f01c75928508a4ec82855ad80d7479ce 100644
--- a/third_party/WebKit/public/platform/WebAudioDevice.h
+++ b/third_party/WebKit/public/platform/WebAudioDevice.h
@@ -34,6 +34,16 @@
 
 namespace blink {
 
+// Representation of device audio stream position.
+
+struct BLINK_PLATFORM_EXPORT WebAudioTimestamp {
+    WebAudioTimestamp() = default;
+    WebAudioTimestamp(size_t frames, double seconds)
+        : frames(frames), seconds(seconds) {}
+    size_t frames;
+    double seconds;
+};
+
 // Abstract interface to the Chromium audio system.
 
 class WebAudioDevice {
@@ -41,6 +51,8 @@ public:
     class BLINK_PLATFORM_EXPORT RenderCallback {
     public:
         virtual void render(const WebVector<float*>& sourceData, const WebVector<float*>& destinationData, size_t numberOfFrames);
+        // An alternate version which provides also a current audio timestamp for the device, default implementation just invokes the above method.
+        virtual void render(const WebVector<float*>& sourceData, const WebVector<float*>& destinationData, size_t numberOfFrames, const WebAudioTimestamp&);
 
     protected:
         virtual ~RenderCallback();