Move Sad Tab implementation out of the TabContentsViews.

content/browser/tab_contents/tab_contents_view.h

 // Copyright (c) 2011 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 CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_VIEW_H_
 #define CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_VIEW_H_
 #pragma once
 
 #include <string>
 
@@ skipping 48 matching lines @@
     GetContainerBounds(&rc);
     return gfx::Size(rc.width(), rc.height());
   }
 
   // Sets the page title for the native widgets corresponding to the view. This
   // is not strictly necessary and isn't expected to be displayed anywhere, but
   // can aid certain debugging tools such as Spy++ on Windows where you are
   // trying to find a specific window.
   virtual void SetPageTitle(const string16& title) = 0;
 
-  // Used to notify the view that a tab has crashed so each platform can
-  // prepare the sad tab.
+  // Used to notify the view that a tab has crashed.
   virtual void OnTabCrashed(base::TerminationStatus status,
                             int error_code) = 0;
 
   // TODO(brettw) this is a hack. It's used in two places at the time of this
   // writing: (1) when render view hosts switch, we need to size the replaced
   // one to be correct, since it wouldn't have known about sizes that happened
   // while it was hidden; (2) in constrained windows.
   //
   // (1) will be fixed once interstitials are cleaned up. (2) seems like it
   // should be cleaned up or done some other way, since this works for normal
@@ skipping 29 matching lines @@
   // TabContents::Close() calls IsEventTracking(), and if it returns
   // true CloseTabAfterEventTracking() is called and the close is not
   // completed.
   virtual bool IsEventTracking() const = 0;
   virtual void CloseTabAfterEventTracking() = 0;
 
   // Get the bounds of the View, relative to the parent.
   // TODO(beng): Return a rect rather than using an out param.
   virtual void GetViewBounds(gfx::Rect* out) const = 0;
 
+  // ---------------------------------------------------------------------------
+  // Functions for embedders.
+  // TODO(avi): Figure out where these go on the API surface.
+
+  // Installs a native view to cover the visible web contents. Removed by
+  // |RemoveOverlayView|. This is not a transfer of ownership, and the view must
+  // remain valid until removed.
+  virtual void InstallOverlayView(gfx::NativeView view) = 0;
+
+  // Removes the native overlay view installed by |InstallOverlayView|.
+  virtual void RemoveOverlayView() = 0;
+
  protected:
   TabContentsView();  // Abstract interface.
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TabContentsView);
 };
 
 #endif  // CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_VIEW_H_