Implement virtual keyboard hiding.

ui/keyboard/keyboard_controller.cc

 // Copyright (c) 2013 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/keyboard/keyboard_controller.h"
 
 #include "ui/aura/layout_manager.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/base/hit_test.h"
@@ skipping 124 matching lines @@
   if (!container_) {
     container_ = new aura::Window(new KeyboardWindowDelegate());
     container_->SetName("KeyboardContainer");
     container_->Init(ui::LAYER_NOT_DRAWN);
     container_->AddObserver(this);
     container_->SetLayoutManager(new KeyboardLayoutManager(container_));
   }
   return container_;
 }
 
+void KeyboardController::HideKeyboard() {
+  if (!container_)
+    return;
+
+  FOR_EACH_OBSERVER(
+      KeyboardControllerObserver,
+      observer_list_,
+      OnKeyboardBoundsChanging(gfx::Rect()));
+
+  proxy_->HideKeyboardContainer(container_);
+}
+
 void KeyboardController::AddObserver(KeyboardControllerObserver* observer) {
   observer_list_.AddObserver(observer);
 }
 
 void KeyboardController::RemoveObserver(KeyboardControllerObserver* observer) {
   observer_list_.RemoveObserver(observer);
 }
 
 void KeyboardController::OnWindowHierarchyChanged(
     const HierarchyChangeParams& params) {
@@ skipping 46 matching lines @@
   // abandon compositions in progress)
 }
 
 void KeyboardController::OnInputMethodDestroyed(
     const ui::InputMethod* input_method) {
   DCHECK_EQ(input_method_, input_method);
   input_method_ = NULL;
 }
 
 }  // namespace keyboard