Fix the full screen switching browser window dipping below launcher bar issue.

ui/aura/root_window.cc

 // Copyright (c) 2012 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/aura/root_window.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 97 matching lines @@
   last_mouse_location_ = host_->QueryMouseLocation();
   synthesize_mouse_move_ = false;
 }
 
 gfx::Size RootWindow::GetHostSize() const {
   gfx::Rect rect(host_->GetSize());
   layer()->transform().TransformRect(&rect);
   return rect.size();
 }
 
+void RootWindow::SetScreenWorkAreaInsets(const gfx::Insets& insets) {
+  if (screen_->work_area_insets() == insets)
+    return;
+  screen_->set_work_area_insets(insets);
+  FOR_EACH_OBSERVER(RootWindowObserver, observers_,
+                    OnScreenWorkAreaInsetsChanged());
+}
+
 void RootWindow::SetCursor(gfx::NativeCursor cursor) {
   last_cursor_ = cursor;
   // A lot of code seems to depend on NULL cursors actually showing an arrow,
   // so just pass everything along to the host.
   host_->SetCursor(cursor);
 }
 
 void RootWindow::ShowCursor(bool show) {
   cursor_shown_ = show;
   host_->ShowCursor(show);
@@ skipping 703 matching lines @@
   // is currently broken. See/ crbug.com/107931.
   MouseEvent event(ui::ET_MOUSE_MOVED,
                    orig_mouse_location,
                    orig_mouse_location,
                    ui::EF_IS_SYNTHESIZED);
   DispatchMouseEvent(&event);
 #endif
 }
 
 }  // namespace aura