Restore virtual keyboard after switch back to FULL_WIDTH mode

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 325 matching lines @@
 void KeyboardController::SetKeyboardMode(KeyboardMode mode) {
   if (keyboard_mode_ == mode)
     return;
 
   keyboard_mode_ = mode;
   // When keyboard is floating, no overscroll or resize is necessary. Sets
   // keyboard bounds to zero so overscroll or resize is disabled.
   if (keyboard_mode_ == FLOATING) {
     NotifyKeyboardBoundsChanging(gfx::Rect());
   } else if (keyboard_mode_ == FULL_WIDTH) {
-    // TODO(bshe): handle switch to FULL_WIDTH from FLOATING mode. We need a way
-    // to know the height of virtual keyboard in FULL_WIDTH mode before here.
+    // TODO(bshe): revisit this logic after we decide to support resize virtual
+    // keyboard.
+    int keyboard_height = GetContainerWindow()->bounds().height();
+    const gfx::Rect& root_bounds = container_->GetRootWindow()->bounds();
+    gfx::Rect new_bounds = root_bounds;
+    new_bounds.set_y(root_bounds.height() - keyboard_height);
+    new_bounds.set_height(keyboard_height);
+    GetContainerWindow()->SetBounds(new_bounds);
+    // No animation added, so call ShowAnimationFinished immediately.
+    ShowAnimationFinished();
   }
 }
 
 void KeyboardController::ShowKeyboard(bool lock) {
   set_lock_keyboard(lock);
   ShowKeyboardInternal();
 }
 
 void KeyboardController::OnWindowHierarchyChanged(
     const HierarchyChangeParams& params) {
@@ skipping 227 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