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extensions/common/constants.h

Index: extensions/common/constants.h
diff --git a/extensions/common/constants.h b/extensions/common/constants.h
index 66fe2ba4d1e6b9250a5bcc29a3940945fa914c50..c95fab6bfb57f7826fceefb979d9ab0641c48fe5 100644
--- a/extensions/common/constants.h
+++ b/extensions/common/constants.h
@@ -139,6 +139,18 @@ extern const size_t kNumExtensionIconSizes;
 extern const int kExtensionActionIconSizes[];
 extern const size_t kNumExtensionActionIconSizes;
 
+// The type of injected script.
+enum InjectedScriptType {
+  // A content script specified in the extension's manifest.
+  CONTENT_SCRIPT,
+  // A script injected via, e.g. tabs.executeScript().
+  PROGRAMMATIC_SCRIPT
+};
+
+// The last type of injected script; used for enum verification in IPC.
+// Update this if you add more injected script types!
+const InjectedScriptType INJECTED_SCRIPT_LAST = PROGRAMMATIC_SCRIPT;
+
 }  // namespace extension_misc
 
 #endif  // EXTENSIONS_COMMON_CONSTANTS_H_