Add a mojo channel for frame messages.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 3ca56c4a5a62aba13b2e82e4fe3d29e1ef8da93e..b714b910ede4bd25636d84b5289254cb3f1fa631 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -111,6 +111,7 @@
 #include "content/renderer/history_serialization.h"
 #include "content/renderer/image_downloader/image_downloader_impl.h"
 #include "content/renderer/ime_event_guard.h"
+#include "content/renderer/input/frame_input_handler_impl.h"
 #include "content/renderer/input/input_handler_manager.h"
 #include "content/renderer/installedapp/related_apps_fetcher.h"
 #include "content/renderer/internal_document_state_data.h"
@@ -6852,6 +6853,9 @@ void RenderFrameImpl::RegisterMojoInterfaces() {
   GetAssociatedInterfaceRegistry()->AddInterface(base::Bind(
       &RenderFrameImpl::BindFrameBindingsControl, weak_factory_.GetWeakPtr()));
 
+  GetInterfaceRegistry()->AddInterface(base::Bind(
+      &FrameInputHandlerImpl::CreateMojoService, weak_factory_.GetWeakPtr()));
+
   if (!frame_->Parent()) {
     // Only main frame have ImageDownloader service.
     GetInterfaceRegistry()->AddInterface(base::Bind(