Create a prominent omnibox UI element to add pages to the app launcher.

chrome/browser/ui/views/location_bar/add_to_app_launcher_view.h

Index: chrome/browser/ui/views/location_bar/add_to_app_launcher_view.h
diff --git a/chrome/browser/ui/views/location_bar/add_to_app_launcher_view.h b/chrome/browser/ui/views/location_bar/add_to_app_launcher_view.h
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index 0000000000000000000000000000000000000000..5cbafce0dd9eed82da68ebe72c0c1427796095b5
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+++ b/chrome/browser/ui/views/location_bar/add_to_app_launcher_view.h
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+// 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.
+
+#ifndef CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_ADD_TO_APP_LAUNCHER_VIEW_H_
+#define CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_ADD_TO_APP_LAUNCHER_VIEW_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "ui/gfx/animation/animation_delegate.h"
+#include "ui/gfx/animation/slide_animation.h"
+#include "ui/views/painter.h"
+#include "ui/views/view.h"
+
+class LocationBarView;
+
+namespace content {
+class WebContents;
+}
+
+namespace gfx {
+class FontList;
+}
+
+namespace views {
+class ImageView;
+class Label;
+}
+
+// The AddToAppLauncherView displays a UI in the location bar to allow adding
+// the current page to the App Launcher.
+class AddToAppLauncherView : public gfx::AnimationDelegate, public views::View {
+ public:
+  AddToAppLauncherView(LocationBarView* parent,
+                       const gfx::FontList& font_list,
+                       SkColor text_color,
+                       SkColor parent_background_color);
+  virtual ~AddToAppLauncherView();
+
+  // Updates the decoration from the shown WebContents.
+  void Update(content::WebContents* web_contents);
+
+ private:
+  // gfx::AnimationDelegate:
+  virtual void AnimationEnded(const gfx::Animation* animation) OVERRIDE;
+  virtual void AnimationProgressed(const gfx::Animation* animation) OVERRIDE;
+  virtual void AnimationCanceled(const gfx::Animation* animation) OVERRIDE;
+
+  // views::View:
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
+  virtual void Layout() OVERRIDE;
+  virtual void OnPaintBackground(gfx::Canvas* canvas) OVERRIDE;
+
+  LocationBarView* parent_;  // Weak, owns us.
+  scoped_ptr<views::Painter> background_painter_;
+  views::ImageView* icon_;
+  views::Label* text_label_;
+  gfx::SlideAnimation slide_animator_;
+
+  DISALLOW_COPY_AND_ASSIGN(AddToAppLauncherView);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_ADD_TO_APP_LAUNCHER_VIEW_H_