views: Extract Widget observer into its own header file.

chrome/browser/ui/views/location_bar/content_setting_image_view.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 "chrome/browser/ui/views/location_bar/content_setting_image_view.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/content_settings/tab_specific_content_settings.h"
 #include "chrome/browser/ui/content_settings/content_setting_bubble_model.h"
 #include "chrome/browser/ui/content_settings/content_setting_image_model.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
 #include "chrome/browser/ui/views/content_setting_bubble_contents.h"
 #include "chrome/browser/ui/views/location_bar/location_bar_view.h"
 #include "content/public/browser/web_contents.h"
 #include "third_party/skia/include/core/SkShader.h"
 #include "ui/base/animation/slide_animation.h"
 #include "ui/base/animation/tween.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/skia_util.h"
 #include "ui/views/border.h"
+#include "ui/views/widget/widget.h"
 
 using content::WebContents;
 
 namespace {
 // Animation parameters.
 const int kOpenTimeMs = 150;
 const int kFullOpenedTimeMs = 3200;
 const int kMoveTimeMs = kFullOpenedTimeMs + 2 * kOpenTimeMs;
 const int kFrameRateHz = 60;
 // Colors for the animated box.
@@ skipping 229 matching lines @@
         1.0 - (visible_text_size_ * kAnimatingFraction) / text_size_);
     pause_animation_ = false;
     slide_animator_->Show();
   }
 }
 
 int ContentSettingImageView::GetBuiltInHorizontalPadding() const {
   return GetBuiltInHorizontalPaddingImpl();
 }