Make SecurityContext available in RemoteFrames.

public/web/WebFrame.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 137 matching lines @@
 
     // For a WebFrame with contents being rendered in another process, this
     // sets a layer for use by the in-process compositor. WebLayer should be
     // null if the content is being rendered in the current process.
     virtual void setRemoteWebLayer(WebLayer*) = 0;
 
     // Initializes the various client interfaces.
     virtual void setPermissionClient(WebPermissionClient*) = 0;
     virtual void setSharedWorkerRepositoryClient(WebSharedWorkerRepositoryClient*) = 0;
 
+    // The security origin of this frame.
+    virtual WebSecurityOrigin securityOrigin() const = 0;

[dcheng, 2014/11/18 23:31:40]

Do we need to call this on remote frames? If not, it might be better to start
with just making this available from WebLocalFrame.

[alexmos, 2014/11/19 00:33:04]

My RenderView test (see *.OriginReplicationForSwapOut in my other CL) needs
WebRemoteFrame::securityOrigin() to check that the replicated origin has been
set properly.

+
     // Geometry -----------------------------------------------------------
 
     // NOTE: These routines do not force page layout so their results may
     // not be accurate if the page layout is out-of-date.
 
     // If set to false, do not draw scrollbars on this frame's view.
     virtual void setCanHaveScrollbars(bool) = 0;
 
     // The scroll offset from the top-left corner of the frame in pixels.
     virtual WebSize scrollOffset() const = 0;
@@ skipping 527 matching lines @@
     WebPrivateOwnPtr<OpenedFrameTracker> m_openedFrameTracker;
 };
 
 #if BLINK_IMPLEMENTATION
 Frame* toCoreFrame(const WebFrame*);
 #endif
 
 } // namespace blink
 
 #endif