Add a Pepper audio basic functionality unit test.

chrome/renderer/mock_render_thread.cc

Index: chrome/renderer/mock_render_thread.cc
diff --git a/chrome/renderer/mock_render_thread.cc b/chrome/renderer/mock_render_thread.cc
index 1fa513fe0c138533696645b82c5d0681fcc71958..35383cbc370728a0a5f472cca3b25557b7ac1134 100644
--- a/chrome/renderer/mock_render_thread.cc
+++ b/chrome/renderer/mock_render_thread.cc
@@ -34,6 +34,16 @@ void MockRenderThread::RemoveRoute(int32 routing_id) {
   widget_ = NULL;
 }
 
+// Called by, for example, RenderView::Init(), when adding a new message filter
+void MockRenderThread::AddFilter(IPC::ChannelProxy::MessageFilter* filter) {
+  filter->OnFilterAdded(&sink());
+}
+
+// Called when the filter is removed
+void MockRenderThread::RemoveFilter(IPC::ChannelProxy::MessageFilter* filter) {
+  filter->OnFilterRemoved();
+}
+
 // Called by the Widget. Used to send messages to the browser.
 // We short-circuit the mechanim and handle the messages right here on this
 // class.
@@ -66,7 +76,7 @@ void MockRenderThread::SendCloseMessage() {
 
 void MockRenderThread::OnMessageReceived(const IPC::Message& msg) {
   // Save the message in the sink.
-  sink_.OnMessageReceived(msg);
+  sink_.Send(const_cast<IPC::Message*>(&msg));
 
   // Some messages we do special handling.
   bool handled = true;