Add a mojo channel for frame messages.

content/browser/browser_plugin/browser_plugin_guest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 872 matching lines @@
   last_drag_status_ = drag_status;
   EndSystemDragIfApplicable();
 }
 
 void BrowserPluginGuest::OnExecuteEditCommand(int browser_plugin_instance_id,
                                               const std::string& name) {
   RenderFrameHost* focused_frame = web_contents()->GetFocusedFrame();
   if (!focused_frame)
     return;
 
-  focused_frame->Send(new InputMsg_ExecuteNoValueEditCommand(
-      focused_frame->GetRoutingID(), name));
+  focused_frame->GetFrameInputHandler()->ExecuteEditCommand(
+      name, base::Optional<std::string>());

[dcheng, 2017/05/17 04:49:06]

Or just nullopt

[dtapuska, 2017/05/17 17:08:07]

Done.

 }
 
 void BrowserPluginGuest::OnImeSetComposition(
     int browser_plugin_instance_id,
     const BrowserPluginHostMsg_SetComposition_Params& params) {
   Send(new InputMsg_ImeSetComposition(
       routing_id(), params.text, params.underlines, params.replacement_range,
       params.selection_start, params.selection_end));
 }
 
@@ skipping 11 matching lines @@
   Send(new InputMsg_ImeFinishComposingText(routing_id(), keep_selection));
 }
 
 void BrowserPluginGuest::OnExtendSelectionAndDelete(
     int browser_plugin_instance_id,
     int before,
     int after) {
   RenderFrameHostImpl* rfh = static_cast<RenderFrameHostImpl*>(
       web_contents()->GetFocusedFrame());
   if (rfh)
-    rfh->ExtendSelectionAndDelete(before, after);
+    rfh->GetFrameInputHandler()->ExtendSelectionAndDelete(before, after);
 }
 
 void BrowserPluginGuest::OnLockMouse(bool user_gesture,
                                      bool last_unlocked_by_target,
                                      bool privileged) {
   if (pending_lock_request_) {
     // Immediately reject the lock because only one pointerLock may be active
     // at a time.
     Send(new ViewMsg_LockMouse_ACK(routing_id(), false));
     return;
@@ skipping 124 matching lines @@
           range, character_bounds);
 }
 #endif
 
 void BrowserPluginGuest::SetContextMenuPosition(const gfx::Point& position) {
   if (delegate_)
     delegate_->SetContextMenuPosition(position);
 }
 
 }  // namespace content