Forward the number of skipped frames by the OS in audio playout.

media/audio/audio_device_thread.h

Index: media/audio/audio_device_thread.h
diff --git a/media/audio/audio_device_thread.h b/media/audio/audio_device_thread.h
index 1f63c21d9f96329e71b4d79d92622934464b16ee..220b801faef5d7f3de594ac594ec92d63c67fbee 100644
--- a/media/audio/audio_device_thread.h
+++ b/media/audio/audio_device_thread.h
@@ -50,8 +50,11 @@ class MEDIA_EXPORT AudioDeviceThread {
     // before Process can be called.
     virtual void MapSharedMemory() = 0;
 
-    // Called whenever we receive notifications about pending data.
-    virtual void Process(uint32 pending_data) = 0;
+    // Called whenever we receive notifications about pending input data.
+    // |frames_skipped| contains the number of frames that has been skipped. The
+    // source can handle this appropriately depending on its type. An ordinary
+    // file playout would ignore this.
+    virtual void Process(uint32_t pending_data, uint32_t frames_skipped) = 0;
 
    protected:
     // Protected so that derived classes can access directly.
@@ -75,11 +78,17 @@ class MEDIA_EXPORT AudioDeviceThread {
 
   // Starts the audio thread. The thread must not already be running.  If
   // |sychronized_buffers| is set, the browser expects to be notified via the
-  // |socket| every time AudioDeviceThread::Process() completes.
+  // |socket| every time AudioDeviceThread::Process() completes. |input| should
+  // be true for input and false for output. It is used for reading the right
+  // amount of data from the socket.
+  // TODO(grunell): |input| is ugly, but there are plans to re-use a thread for
+  // multiple inputs/outputs (see todo comment above) so we do it this way
+  // meanwhile instead of using separate classes.
   void Start(AudioDeviceThread::Callback* callback,
              base::SyncSocket::Handle socket,
              const char* thread_name,
-             bool synchronized_buffers);
+             bool synchronized_buffers,
+             bool input);
 
   // This tells the audio thread to stop and clean up the data.
   // The method can stop the thread synchronously or asynchronously.