Add printing tests to ensure window.print() works for subframes.

content/public/browser/render_frame_host.h

 // Copyright 2013 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_RENDER_FRAME_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_FRAME_HOST_H_
 
 #include <string>
+#include <vector>
 
 #include "base/callback_forward.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/public/common/console_message_level.h"
 #include "content/public/common/file_chooser_params.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "third_party/WebKit/public/platform/WebPageVisibilityState.h"
 #include "ui/gfx/geometry/rect.h"
@@ skipping 79 matching lines @@
   // Returns the assigned name of the frame, the name of the iframe tag
   // declaring it. For example, <iframe name="framename">[...]</iframe>. It is
   // quite possible for a frame to have no name, in which case GetFrameName will
   // return an empty string.
   virtual const std::string& GetFrameName() = 0;
 
   // Returns true if the frame is out of process.
   virtual bool IsCrossProcessSubframe() = 0;
 
   // Returns the last committed URL of the frame.
-  virtual const GURL& GetLastCommittedURL() = 0;
+  virtual const GURL& GetLastCommittedURL() const = 0;
 
   // Returns the last committed origin of the frame.
   //
   // The origin is only available if this RenderFrameHost is current in the
   // frame tree -- i.e., it would be visited by WebContents::ForEachFrame. In
   // particular, this method may CHECK if called from
   // WebContentsObserver::RenderFrameCreated, since non-current frames can be
   // passed to that observer method.
   virtual url::Origin GetLastCommittedOrigin() = 0;
 
@@ skipping 105 matching lines @@
 
  private:
   // This interface should only be implemented inside content.
   friend class RenderFrameHostImpl;
   RenderFrameHost() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_FRAME_HOST_H_