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 f6a206c5de4d0f99854296f0f3f35806414b61e4..0dfbe0c006b99c66d7f4813b328fcad61748894a 100644
--- a/extensions/common/manifest_constants.h
+++ b/extensions/common/manifest_constants.h
@@ -189,6 +189,7 @@ extern const char kWebviewAccessibleResources[];
 extern const char kWebviewPartitions[];
 extern const char kWhitelist[];
 #if defined(OS_CHROMEOS)
+extern const char kActionHandlers[];
 extern const char kFileSystemProviderCapabilities[];
 #endif
 }  // namespace manifest_keys
@@ -490,6 +491,8 @@ extern const char kUnrecognizedManifestProperty[];
 extern const char kWebRequestConflictsWithLazyBackground[];
 #if defined(OS_CHROMEOS)
 extern const char kIllegalPlugins[];
+extern const char kInvalidActionHandlersActionType[];
+extern const char kInvalidActionHandlersType[];
 extern const char kInvalidFileSystemProviderMissingCapabilities[];
 extern const char kInvalidFileSystemProviderMissingPermission[];
 #endif