mash: Don't synthesize extra key press events in the window server

chrome/browser/ui/views/ime_driver/input_method_bridge_chromeos.cc

 // Copyright 2016 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 "chrome/browser/ui/views/ime_driver/input_method_bridge_chromeos.h"
 
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/ui/views/ime_driver/remote_text_input_client.h"
 
 InputMethodBridge::InputMethodBridge(
@@ skipping 19 matching lines @@
 
 void InputMethodBridge::ProcessKeyEvent(
     std::unique_ptr<ui::Event> event,
     const ProcessKeyEventCallback& callback) {
   DCHECK(event->IsKeyEvent());
   ui::KeyEvent* key_event = event->AsKeyEvent();
   if (!key_event->is_char()) {
     input_method_chromeos_->DispatchKeyEvent(
         key_event, base::MakeUnique<base::Callback<void(bool)>>(callback));
   } else {
-    // On Linux (include ChromeOS), the mus emulates the WM_CHAR generation
-    // behaviour of Windows. But for ChromeOS, we don't expect those char
-    // events, so we filter them out.
-    const bool handled = true;
+    const bool handled = false;
     callback.Run(handled);
   }
 }
 
 void InputMethodBridge::CancelComposition() {
   input_method_chromeos_->CancelComposition(client_.get());
 }