Implement an initial extension settings API.

chrome/test/testing_profile.cc

Index: chrome/test/testing_profile.cc
diff --git a/chrome/test/testing_profile.cc b/chrome/test/testing_profile.cc
index 08dd6919d101708e15eb1bf1f8fac1f47a41a31c..dca076beb43ac620af852c197ed0e81c3d36b984 100644
--- a/chrome/test/testing_profile.cc
+++ b/chrome/test/testing_profile.cc
@@ -20,6 +20,7 @@
 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
 #include "chrome/browser/extensions/extension_pref_value_map.h"
 #include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/extension_settings.h"
 #include "chrome/browser/extensions/extension_special_storage_policy.h"
 #include "chrome/browser/favicon/favicon_service.h"
 #include "chrome/browser/geolocation/geolocation_content_settings_map.h"
@@ -338,10 +339,13 @@ ExtensionService* TestingProfile::CreateExtensionService(
       new ExtensionPrefs(GetPrefs(),
                          install_directory,
                          extension_pref_value_map_.get()));
+  extension_settings_.reset(
+      new ExtensionSettings(GetPath().AppendASCII("Extension Settings")));
   extension_service_.reset(new ExtensionService(this,
                                                 command_line,
                                                 install_directory,
                                                 extension_prefs_.get(),
+                                                extension_settings_.get(),
                                                 autoupdate_enabled,
                                                 true));
   return extension_service_.get();