Adds OnChildWindowVisibilityChanged to ui::WindowObserver

services/ui/ws/window_manager_client_unittest.cc

 // Copyright 2014 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 <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 526 matching lines @@
 
 class VisibilityChangeObserver : public WindowObserver {
  public:
   explicit VisibilityChangeObserver(Window* window) : window_(window) {
     window_->AddObserver(this);
   }
   ~VisibilityChangeObserver() override { window_->RemoveObserver(this); }
 
  private:
   // Overridden from WindowObserver:
-  void OnWindowVisibilityChanged(Window* window) override {
+  void OnWindowVisibilityChanged(Window* window, bool visible) override {
     EXPECT_EQ(window, window_);
     EXPECT_TRUE(WindowServerTestBase::QuitRunLoop());
   }
 
   Window* window_;
 
   DISALLOW_COPY_AND_ASSIGN(VisibilityChangeObserver);
 };
 
 }  // namespace
@@ skipping 572 matching lines @@
   ASSERT_TRUE(window_in_wm);
 
   // Change the bounds in the wm, and make sure the child sees it.
   window_in_wm->SetBounds(gfx::Rect(1, 11, 12, 101));
   ASSERT_TRUE(WaitForBoundsToChange(window_in_second_client));
   EXPECT_EQ(gfx::Rect(1, 11, 12, 101), window_in_second_client->bounds());
 }
 
 }  // namespace ws
 }  // namespace ui