Don't send unnecessary ExtensionMsg_Loaded IPCs.

extensions/renderer/script_context.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_SCRIPT_CONTEXT_H_
 #define EXTENSIONS_RENDERER_SCRIPT_CONTEXT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 105 matching lines @@
 
   void DispatchEvent(const char* event_name, v8::Local<v8::Array> args) const;
 
   // Fires the onunload event on the unload_event module.
   void DispatchOnUnloadEvent();
 
   // Returns the availability of the API |api_name|.
   Feature::Availability GetAvailability(const std::string& api_name);
 
   // Returns a string description of the type of context this is.
-  std::string GetContextTypeDescription();
+  std::string GetContextTypeDescription() const;
 
   // Returns a string description of the effective type of context this is.
-  std::string GetEffectiveContextTypeDescription();
+  std::string GetEffectiveContextTypeDescription() const;
 
   v8::Isolate* isolate() const { return isolate_; }
 
   // Get the URL of this context's web frame.
   //
   // TODO(kalman): Remove this and replace with a GetOrigin() call which reads
   // of WebDocument::securityOrigin():
   //  - The URL can change (e.g. pushState) but the origin cannot. Luckily it
   //    appears as though callers don't make security decisions based on the
   //    result of GetURL() so it's not a problem... yet.
@@ skipping 33 matching lines @@
   // a context for an extension which has that permission, or by being a web
   // context which has been granted the corresponding capability by an
   // extension.
   bool HasAPIPermission(APIPermission::ID permission) const;
 
   // Throws an Error in this context's JavaScript context, if this context does
   // not have access to |name|. Returns true if this context has access (i.e.
   // no exception thrown), false if it does not (i.e. an exception was thrown).
   bool HasAccessOrThrowError(const std::string& name);
 
+  // Returns a string representation of this ScriptContext, for debugging.
+  std::string GetDebugString() const;
+
  private:
   class Runner;
 
   // Whether this context is valid.
   bool is_valid_;
 
   // The v8 context the bindings are accessible to.
   v8::Global<v8::Context> v8_context_;
 
   // The WebLocalFrame associated with this context. This can be NULL because
@@ skipping 33 matching lines @@
   GURL url_;
 
   scoped_ptr<Runner> runner_;
 
   DISALLOW_COPY_AND_ASSIGN(ScriptContext);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_SCRIPT_CONTEXT_H_