Adds chromium side plumbing to pass speech input calls back and forth with WebKit.

chrome/browser/renderer_host/resource_message_filter.h

Index: chrome/browser/renderer_host/resource_message_filter.h
diff --git a/chrome/browser/renderer_host/resource_message_filter.h b/chrome/browser/renderer_host/resource_message_filter.h
index c112b77c63b3224445eb7c8cd3f27cdeebb25aa7..ec228b5504e9264f3b6c227f8a444b5a87d0d40d 100644
--- a/chrome/browser/renderer_host/resource_message_filter.h
+++ b/chrome/browser/renderer_host/resource_message_filter.h
@@ -61,6 +61,10 @@ class PrinterQuery;
 class PrintJobManager;
 }
 
+namespace speech_input {
+class SpeechInputDispatcherHost;
+}
+
 namespace webkit_glue {
 struct WebCookie;
 }
@@ -441,6 +445,10 @@ class ResourceMessageFilter : public IPC::ChannelProxy::MessageFilter,
   // A callback to create a routing id for the associated renderer process.
   scoped_ptr<CallbackWithReturnValue<int>::Type> next_route_id_callback_;
 
+  // Used to handle speech input related messages.
+  scoped_refptr<speech_input::SpeechInputDispatcherHost>
+      speech_input_dispatcher_host_;
+
   // Used to handle geolocation-related messages.
   scoped_refptr<GeolocationDispatcherHost> geolocation_dispatcher_host_;