Initial work on making extensions work in incognito mode.

chrome/renderer/user_script_slave.h

Index: chrome/renderer/user_script_slave.h
diff --git a/chrome/renderer/user_script_slave.h b/chrome/renderer/user_script_slave.h
index cf8fb8d85933a8ce45f9af15602d5df9bffbdc12..4cbbfd274827e15b6b4b31de89becfc7db5421e8 100644
--- a/chrome/renderer/user_script_slave.h
+++ b/chrome/renderer/user_script_slave.h
@@ -31,8 +31,11 @@ class UserScriptSlave {
   // Returns the unique set of extension IDs this UserScriptSlave knows about.
   void GetActiveExtensions(std::set<std::string>* extension_ids);
 
-  // Update the parsed scripts from shared memory.
-  bool UpdateScripts(base::SharedMemoryHandle shared_memory);
+  // Update the parsed scripts from shared memory. If |only_inject_incognito|
+  // is true, we will only use the scripts that have been marked as enabled for
+  // incognito mode.
+  bool UpdateScripts(base::SharedMemoryHandle shared_memory,
+                     bool only_inject_incognito);
 
   // Inject the appropriate scripts into a frame based on its URL.
   // TODO(aa): Extract a UserScriptFrame interface out of this to improve