Add a centralized mechanism for whitelisting access to extension permissions.

chrome/common/extensions/extension_constants.h

Index: chrome/common/extensions/extension_constants.h
diff --git a/chrome/common/extensions/extension_constants.h b/chrome/common/extensions/extension_constants.h
index cf9f16eb547c309bfdd30a1b37594d1f602d27b5..3656155cb70294198027550443c63f2e6a84a11f 100644
--- a/chrome/common/extensions/extension_constants.h
+++ b/chrome/common/extensions/extension_constants.h
@@ -349,6 +349,12 @@ namespace extension_misc {
   // The extension id of the bookmark manager.
   extern const char kBookmarkManagerId[];
 
+  // The extension id of the Enterprise Web Store component application.
+  extern const char kEnterpriseWebStoreAppId[];
+
+  // The extension id of the HTerm app for ChromeOS.
+  extern const char kHTermAppId[];
+
   // The extension id of the Web Store component application.
   extern const char kWebStoreAppId[];