components: Create web_modal component.

components/web_modal/web_contents_modal_dialog_manager_delegate.h

 // 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.
 
-#ifndef CHROME_BROWSER_UI_WEB_CONTENTS_MODAL_DIALOG_MANAGER_DELEGATE_H_
-#define CHROME_BROWSER_UI_WEB_CONTENTS_MODAL_DIALOG_MANAGER_DELEGATE_H_
-
-class WebContentsModalDialogHost;
+#ifndef COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_MANAGER_DELEGATE_H_
+#define COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_MANAGER_DELEGATE_H_
 
 namespace content {
 class WebContents;
 }
 
 namespace gfx {
 class Point;
 }
 
+namespace web_modal {
+
+class WebContentsModalDialogHost;
+
 class WebContentsModalDialogManagerDelegate {
  public:
   // Changes the blocked state of |web_contents|. WebContentses are considered
   // blocked while displaying a web contents modal dialog. During that time
   // renderer host will ignore any UI interaction within WebContents outside of
   // the currently displaying dialog.
   virtual void SetWebContentsBlocked(content::WebContents* web_contents,
                                      bool blocked);
 
   // Returns the WebContentsModalDialogHost for use in positioning web contents
   // modal dialogs within the browser window.
   virtual WebContentsModalDialogHost* GetWebContentsModalDialogHost();
 
+  // Returns whether the WebContents is currently visible or not.
+  virtual bool IsWebContentsVisible(content::WebContents* web_contents);
+
  protected:
   virtual ~WebContentsModalDialogManagerDelegate();
 };
 
-#endif  // CHROME_BROWSER_UI_WEB_CONTENTS_MODAL_DIALOG_MANAGER_DELEGATE_H_
+}  // namespace web_modal
+
+#endif  // COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_MANAGER_DELEGATE_H_