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 c6c1e34d157bc3ba9c5771e9fbe6d5a2a0faa12f..80e461ad5df1a47034c7aef4746ae93231794188 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"
@@ -6854,6 +6855,9 @@ void RenderFrameImpl::RegisterMojoInterfaces() {
   GetAssociatedInterfaceRegistry()->AddInterface(base::Bind(
       &RenderFrameImpl::BindFrameBindingsControl, weak_factory_.GetWeakPtr()));
 
+  GetInterfaceRegistry()->AddInterface(base::Bind(
+      &FrameInputHandlerImpl::CreateMojoService, base::Unretained(this)));
+
   if (!frame_->Parent()) {
     // Only main frame have ImageDownloader service.
     GetInterfaceRegistry()->AddInterface(base::Bind(