Partial fix for keyboard occlusion.

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"
 #include "ui/base/ime/input_method.h"
 #include "ui/base/ime/text_input_client.h"
 #include "ui/base/ime/text_input_type.h"
 #include "ui/gfx/path.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/skia_util.h"
+#include "ui/keyboard/keyboard_controller_observer.h"
 #include "ui/keyboard/keyboard_controller_proxy.h"
 
 namespace {
 
 gfx::Rect KeyboardBoundsFromWindowBounds(const gfx::Rect& window_bounds) {
   const float kKeyboardHeightRatio = 0.3f;
   return gfx::Rect(
       window_bounds.x(),
       window_bounds.y() + window_bounds.height() * (1 - kKeyboardHeightRatio),
       window_bounds.width(),
@@ skipping 107 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::AddObserver(KeyboardControllerObserver* observer) {
+  observer_list_.AddObserver(observer);
+}
+
+void KeyboardController::RemoveObserver(KeyboardControllerObserver* observer) {
+  observer_list_.RemoveObserver(observer);
+}
+
 void KeyboardController::OnWindowParentChanged(aura::Window* window,
                                                aura::Window* parent) {
   OnTextInputStateChanged(proxy_->GetInputMethod()->GetTextInputClient());
 }
 
 void KeyboardController::OnWindowDestroying(aura::Window* window) {
   DCHECK_EQ(container_, window);
   container_ = NULL;
 }
 
 void KeyboardController::OnTextInputStateChanged(
     const ui::TextInputClient* client) {
   if (!container_)
     return;
 
+  bool was_showing = container_->IsVisible();
+  bool should_show = was_showing;
   if (!client || client->GetTextInputType() == ui::TEXT_INPUT_TYPE_NONE) {
-    container_->Hide();
+    should_show = false;
   } else {
     if (container_->children().empty()) {
       aura::Window* keyboard = proxy_->GetKeyboardWindow();
       keyboard->Show();
       container_->AddChild(keyboard);
       container_->layout_manager()->OnWindowResized();
     }
     container_->parent()->StackChildAtTop(container_);
-    container_->Show();
+    should_show = true;
   }
+
+  if (was_showing != should_show) {
+    gfx::Rect new_bounds(
+        should_show ? container_->children()[0]->bounds() : gfx::Rect());
+
+    FOR_EACH_OBSERVER(
+        KeyboardControllerObserver,
+        observer_list_,
+        OnKeyboardBoundsChanging(new_bounds));
+
+    if (should_show)
+      container_->Show();
+    else
+      container_->Hide();
+  }
+
   // TODO(bryeung): whenever the TextInputClient changes we need to notify the
   // keyboard (with the TextInputType) so that it can reset it's state (e.g.
   // abandon compositions in progress)
 }
 
 void KeyboardController::OnInputMethodDestroyed(
     const ui::InputMethod* input_method) {
   DCHECK_EQ(input_method_, input_method);
   input_method_ = NULL;
 }
 
 }  // namespace keyboard