Revert of Remove about:srcdoc url conversion.

content/public/browser/navigation_handle.h

 // Copyright 2015 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_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_
 #define CONTENT_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 55 matching lines @@
   virtual bool IsParentMainFrame() = 0;
 
   // Whether the navigation was initated by the renderer process. Examples of
   // renderer-initiated navigations include:
   //  * <a> link click
   //  * changing window.location.href
   //  * redirect via the <meta http-equiv="refresh"> tag
   //  * using window.history.pushState
   virtual bool IsRendererInitiated() = 0;
 
+  // Whether the navigation is for an iframe with srcdoc attribute.
+  virtual bool IsSrcdoc() = 0;
+
   // Returns the FrameTreeNode ID for the frame in which the navigation is
   // performed. This ID is browser-global and uniquely identifies a frame that
   // hosts content. The identifier is fixed at the creation of the frame and
   // stays constant for the lifetime of the frame.
   virtual int GetFrameTreeNodeId() = 0;
 
   // Returns the FrameTreeNode ID for the parent frame. If this navigation is
   // taking place in the main frame, the value returned is -1.
   virtual int GetParentFrameTreeNodeId() = 0;
 
@@ skipping 159 matching lines @@
 
   // The NavigationData that the embedder returned from
   // ResourceDispatcherHostDelegate::GetNavigationData during commit. This will
   // be a clone of the NavigationData.
   virtual NavigationData* GetNavigationData() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_