Chrome app manifest support for action handlers.

extensions/common/manifest_constants.h

Index: extensions/common/manifest_constants.h
diff --git a/extensions/common/manifest_constants.h b/extensions/common/manifest_constants.h
index 64ac2fdaf7f4d7dc09e40ef7a490bc581b3cb199..e365f569b13ddf0cb36f669c315f151154950805 100644
--- a/extensions/common/manifest_constants.h
+++ b/extensions/common/manifest_constants.h
@@ -13,6 +13,7 @@ namespace extensions {
 namespace manifest_keys {
 
 extern const char kAboutPage[];
+extern const char kActionHandlers[];
 extern const char kAllFrames[];
 extern const char kAltKey[];
 extern const char kApp[];
@@ -271,6 +272,8 @@ extern const char kExpectString[];
 extern const char kFileNotFound[];
 extern const char kInvalidAboutPage[];
 extern const char kInvalidAboutPageExpectRelativePath[];
+extern const char kInvalidActionHandlersActionType[];
+extern const char kInvalidActionHandlersType[];
 extern const char kInvalidAllFrames[];
 extern const char kInvalidAppIconColor[];
 extern const char kInvalidBackground[];