Small cleanup to extension function registration to avoid scattered definitions.

chrome/browser/extensions/extension_function.h

 // Copyright (c) 2009 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_
 
 #include <string>
 
 #include "base/values.h"
 #include "base/scoped_ptr.h"
 #include "base/ref_counted.h"
 #include "chrome/browser/extensions/extension_function_dispatcher.h"
 
 class ExtensionFunctionDispatcher;
 class Profile;
 
 #define EXTENSION_FUNCTION_VALIDATE(test) do { \
     if (!(test)) { \
       bad_message_ = true; \
       return false; \
     } \
   } while (0)
 
+#define DECLARE_EXTENSION_FUNCTION_NAME(name) \
+  public: static const char* function_name() { return name; }
+
 // Abstract base class for extension functions the ExtensionFunctionDispatcher
 // knows how to dispatch to.
 //
 // TODO(aa): This will have to become reference counted when we introduce
 // APIs that live beyond a single stack frame.
 class ExtensionFunction : public base::RefCounted<ExtensionFunction> {
  public:
   ExtensionFunction() : request_id_(-1), name_(""), has_callback_(false) {}
   virtual ~ExtensionFunction() {}
 
@@ skipping 124 matching lines @@
 
   virtual void Run() {
     SendResponse(RunImpl());
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SyncExtensionFunction);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_FUNCTION_H_