Signal extension API schema corruption to the browser process.

extensions/common/extension_messages.h

Index: extensions/common/extension_messages.h
diff --git a/extensions/common/extension_messages.h b/extensions/common/extension_messages.h
index 320bda7ac3622a32fcd3a76fae908b12b0f5ba33..6576121d421723e263637c373d6c6d386e103b8e 100644
--- a/extensions/common/extension_messages.h
+++ b/extensions/common/extension_messages.h
@@ -831,6 +831,11 @@ IPC_MESSAGE_CONTROL2(ExtensionHostMsg_WakeEventPage,
                      int /* request_id */,
                      std::string /* extension_id */)
 
+// Notifies the browser that the specified extension API schema could not be
+// parsed.
+IPC_MESSAGE_CONTROL1(ExtensionHostMsg_NotifyBadExtensionApiSchema,
+                     std::string /* api */);
+
 // Tells listeners that a detailed message was reported to the console by
 // WebKit.
 IPC_MESSAGE_ROUTED4(ExtensionHostMsg_DetailedConsoleMessageAdded,