Add ApiActivityMonitor to decouple ActivityLog from low-level extensions code

apps/shell/browser/shell_extensions_browser_client.cc

 // Copyright 2013 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.
 
 #include "apps/shell/browser/shell_extensions_browser_client.h"
 
 #include "apps/shell/browser/shell_app_sorting.h"
 #include "apps/shell/browser/shell_extension_system.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/pref_service_factory.h"
@@ skipping 104 matching lines @@
 }
 
 content::JavaScriptDialogManager*
 ShellExtensionsBrowserClient::GetJavaScriptDialogManager() {
   // TODO(jamescook): Create a JavaScriptDialogManager or reuse the one from
   // content_shell.
   NOTREACHED();
   return NULL;
 }
 
+ApiActivityMonitor* ShellExtensionsBrowserClient::GetApiActivityMonitor(
+    BrowserContext* context) {
+  // app_shell doesn't monitor API function calls or events.
+  return NULL;
+}
+
 std::vector<BrowserContextKeyedServiceFactory*>
 ShellExtensionsBrowserClient::GetExtensionSystemDependencies() {
   return ShellExtensionSystem::GetDependencies();
 }
 
 ExtensionSystem* ShellExtensionsBrowserClient::CreateExtensionSystem(
     BrowserContext* context) {
   return new ShellExtensionSystem(context);
 }
 
 }  // namespace extensions