Keep non-key event handling in-house for NativeWidgetMus

ui/views/mus/native_widget_mus.cc

 // Copyright 2015 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 "ui/views/mus/native_widget_mus.h"
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 1303 matching lines @@
 }
 
 void NativeWidgetMus::OnWindowInputEvent(
     mus::Window* view,
     const ui::Event& event_in,
     std::unique_ptr<base::Callback<void(EventResult)>>* ack_callback) {
   // Take ownership of the callback, indicating that we will handle it.
   EventAckHandler ack_handler(std::move(*ack_callback));
 
   std::unique_ptr<ui::Event> event = ui::Event::Clone(event_in);
-  // TODO(markdittmer): This should be this->OnEvent(event.get()), but that
-  // can't happen until IME is refactored out of in WindowTreeHostMus.
-  platform_window_delegate()->DispatchEvent(event.get());
+
+  if (!event->IsKeyEvent()) {
+    OnEvent(event.get());
+  } else {
+    // TODO(markdittmer): This should be this->OnEvent(event.get()), but that
+    // can't happen until IME is refactored out of in WindowTreeHostMus.
+    platform_window_delegate()->DispatchEvent(event.get());
+  }
   // NOTE: |this| may be deleted.
 
   ack_handler.set_handled(event->handled());
   // |ack_handler| acks the event on destruction if necessary.
 }
 
 void NativeWidgetMus::OnMusWindowVisibilityChanging(mus::Window* window) {
   if (window == window_) {
     native_widget_delegate_->OnNativeWidgetVisibilityChanging(
         !window->visible());
@@ skipping 27 matching lines @@
 
   gfx::Path mask_path;
   native_widget_delegate_->GetHitTestMask(&mask_path);
   // TODO(jamescook): Use the full path for the mask.
   gfx::Rect mask_rect =
       gfx::ToEnclosingRect(gfx::SkRectToRectF(mask_path.getBounds()));
   window_->SetHitTestMask(mask_rect);
 }
 
 }  // namespace views