Stop copying script contents for each RenderFrames.

extensions/renderer/user_script_set.h

 // Copyright 2014 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 EXTENSIONS_RENDERER_USER_SCRIPT_SET_H_
 #define EXTENSIONS_RENDERER_USER_SCRIPT_SET_H_
 
+#include <map>
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/shared_memory.h"
 #include "base/observer_list.h"
 #include "extensions/common/user_script.h"
+#include "third_party/WebKit/public/platform/WebString.h"
 
 class GURL;
 
 namespace content {
 class RenderFrame;
 }
 
 namespace extensions {
 class ScriptInjection;
 
@@ skipping 38 matching lines @@
       UserScript::RunLocation run_location,
       const GURL& document_url,
       bool log_activity);
 
   // Updates scripts given the shared memory region containing user scripts.
   // Returns true if the scripts were successfully updated.
   bool UpdateUserScripts(base::SharedMemoryHandle shared_memory,
                          const std::set<HostID>& changed_hosts,
                          bool whitelisted_only);
 
+  // Returns the contents of a script file.
+  // Note that copying is cheap as this uses WebString.
+  blink::WebString GetJsSource(const UserScript::File& file,
+                               bool emulate_greasemonkey);
+  blink::WebString GetCssSource(const UserScript::File& file);
+
  private:
   // Returns a new ScriptInjection for the given |script| to execute in the
   // |render_frame|, or NULL if the script should not execute.
   std::unique_ptr<ScriptInjection> GetInjectionForScript(
       const UserScript* script,
       content::RenderFrame* render_frame,
       int tab_id,
       UserScript::RunLocation run_location,
       const GURL& document_url,
       bool is_declarative,
       bool log_activity);
 
   // Shared memory containing raw script data.
   std::unique_ptr<base::SharedMemory> shared_memory_;
 
   // The UserScripts this injector manages.
   UserScriptList scripts_;
 
+  // Map of user script file url -> source.
+  std::map<GURL, blink::WebString> script_sources_;
+
   // The associated observers.
   base::ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(UserScriptSet);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_USER_SCRIPT_SET_H_