Implement an initial extension settings API.

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index 3bed716201543043d856b891e76783934e819fad..2afc9c72f7e64b58239a62bb8d1d8f143df04e77 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -44,6 +44,7 @@ class ExtensionContentSettingsStore;
 class ExtensionInstallUI;
 class ExtensionPreferenceEventRouter;
 class ExtensionServiceBackend;
+class ExtensionSettings;
 struct ExtensionSyncData;
 class ExtensionToolbarModel;
 class ExtensionUpdater;
@@ -186,6 +187,7 @@ class ExtensionService
                    const CommandLine* command_line,
                    const FilePath& install_directory,
                    ExtensionPrefs* extension_prefs,
+                   ExtensionSettings* extension_settings,
                    bool autoupdate_enabled,
                    bool extensions_enabled);
 
@@ -429,6 +431,8 @@ class ExtensionService
   // ExtensionPrefs* mutable_extension_prefs().
   ExtensionPrefs* extension_prefs();
 
+  ExtensionSettings* extension_settings();
+
   ExtensionContentSettingsStore* GetExtensionContentSettingsStore();
 
   // Whether the extension service is ready.
@@ -603,6 +607,9 @@ class ExtensionService
   // Preferences for the owning profile (weak reference).
   ExtensionPrefs* extension_prefs_;
 
+  // Settings for the owning profile (weak reference).
+  ExtensionSettings* extension_settings_;
+
   // The current list of installed extensions.
   // TODO(aa): This should use chrome/common/extensions/extension_set.h.
   ExtensionList extensions_;