Add a Submit method to the keyboard interface

examples/keyboard_client/keyboard_client.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 <algorithm>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "mojo/application/application_runner_chromium.h"
 #include "mojo/gpu/gl_texture.h"
@@ skipping 228 matching lines @@
 
   void SetComposingRegion(int32_t start, int32_t end) override { DrawText(); }
 
   void SetComposingText(const mojo::String& text,
                         int32_t new_cursor_position) override {
     DrawText();
   }
 
   void SetSelection(int32_t start, int32_t end) override { DrawText(); }
 
+  void Submit(keyboard::SubmitAction action) override {}
+
   // mojo::ViewObserver implementation.
   void OnViewDestroyed(mojo::View* view) override {
     if (view == text_view_) {
       text_view_->RemoveObserver(this);
       text_view_ = nullptr;
     }
   }
 
   void OnViewBoundsChanged(mojo::View* view,
                            const mojo::Rect& old_bounds,
@@ skipping 135 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardDelegate);
 };
 
 }  // namespace examples
 
 MojoResult MojoMain(MojoHandle application_request) {
   mojo::ApplicationRunnerChromium runner(new examples::KeyboardDelegate);
   return runner.Run(application_request);
 }