Avoids irregular OnMoreData callbacks on Windows using Core Audio

content/test/webrtc_audio_device_test.cc

Index: content/test/webrtc_audio_device_test.cc
diff --git a/content/test/webrtc_audio_device_test.cc b/content/test/webrtc_audio_device_test.cc
index b31d4bb50f94aaa12b6b922c91ccaf0ffb32c434..23324895908320ec7caab8667f5abe23f03240e5 100644
--- a/content/test/webrtc_audio_device_test.cc
+++ b/content/test/webrtc_audio_device_test.cc
@@ -282,6 +282,12 @@ void WebRTCAudioDeviceTest::OnGetHardwareInputChannelLayout(
           media::AudioManagerBase::kDefaultDeviceId);
 }
 
+void WebRTCAudioDeviceTest::OnGetHardwareBufferSize(uint32* buffer_size) {
+  EXPECT_TRUE(audio_util_callback_);
+  *buffer_size = audio_util_callback_ ?
+      audio_util_callback_->GetAudioOutputBufferSize() : 0;
+}
+
 // IPC::Listener implementation.
 bool WebRTCAudioDeviceTest::OnMessageReceived(const IPC::Message& message) {
   if (render_thread_) {
@@ -316,6 +322,8 @@ bool WebRTCAudioDeviceTest::OnMessageReceived(const IPC::Message& message) {
                         OnGetHardwareInputSampleRate)
     IPC_MESSAGE_HANDLER(ViewHostMsg_GetHardwareInputChannelLayout,
                         OnGetHardwareInputChannelLayout)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_GetHardwareBufferSize,
+                        OnGetHardwareBufferSize)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP_EX()