Add support for a "split" incognito behavior for extensions.

chrome/browser/extensions/extension_function.h

 // Copyright (c) 2010 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_EXTENSIONS_EXTENSION_FUNCTION_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_FUNCTION_H_
 #pragma once
 
 #include <string>
 #include <list>
@@ skipping 131 matching lines @@
   // The name of this function.
   std::string name_;
 
   // The URL of the frame which is making this request
   GURL source_url_;
 
   // True if the js caller provides a callback function to receive the response
   // of this call.
   bool has_callback_;
 
-  // True if this callback should include information from incognito contexts.
+  // True if this callback should include information from incognito contexts
+  // even if our profile_ is non-incognito. Note that in the case of a "split"
+  // mode extension, this will always be false, and we will limit access to
+  // data from within the same profile_ (either incognito or not).
   bool include_incognito_;
 
   // True if the call was made in response of user gesture.
   bool user_gesture_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionFunction);
 };
 
 // Base class for an extension function that runs asynchronously *relative to
 // the browser's UI thread*.
@@ skipping 59 matching lines @@
   virtual void Run();
 
  protected:
   virtual ~SyncExtensionFunction();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SyncExtensionFunction);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_FUNCTION_H_