Implements onBoundsChanged event in virtualKeyboardPrivate namespace

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 <set>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 193 matching lines @@
       keyboard_visible_(false),
       show_on_resize_(false),
       lock_keyboard_(false),
       keyboard_mode_(FULL_WIDTH),
       type_(ui::TEXT_INPUT_TYPE_NONE),
       weak_factory_(this) {
   CHECK(proxy);
   input_method_ = proxy_->GetInputMethod();
   input_method_->AddObserver(this);
   window_bounds_observer_.reset(new WindowBoundsChangeObserver());
+  proxy_->SetController(this);
 }
 
 KeyboardController::~KeyboardController() {
   if (container_) {
     if (container_->GetRootWindow())
       container_->GetRootWindow()->RemoveObserver(this);
     container_->RemoveObserver(this);
   }
   if (input_method_)
     input_method_->RemoveObserver(this);
   ResetWindowInsets();
+  proxy_->SetController(nullptr);
 }
 
 // static
 void KeyboardController::ResetInstance(KeyboardController* controller) {
   if (instance_ && instance_ != controller)
     delete instance_;
   instance_ = controller;
 }
 
 // static
@@ skipping 350 matching lines @@
   proxy_->HideKeyboardContainer(container_.get());
 }
 
 void KeyboardController::AddBoundsChangedObserver(aura::Window* window) {
   aura::Window* target_window = window ? window->GetToplevelWindow() : nullptr;
   if (target_window)
     window_bounds_observer_->AddObservedWindow(target_window);
 }
 
 }  // namespace keyboard