Introduce a stable set of errors for inline install

chrome/common/extensions/chrome_extension_messages.h

Index: chrome/common/extensions/chrome_extension_messages.h
diff --git a/chrome/common/extensions/chrome_extension_messages.h b/chrome/common/extensions/chrome_extension_messages.h
index 8b2fb7ae12813a1a37601e25cb247db47ab23c18..f0a08b5c08e3a45b4c477ad7ccf1f215afef7179 100644
--- a/chrome/common/extensions/chrome_extension_messages.h
+++ b/chrome/common/extensions/chrome_extension_messages.h
@@ -9,6 +9,7 @@
 // Multiply-included message file, hence no include guard.
 
 #include "chrome/common/extensions/api/webstore/webstore_api_constants.h"
+#include "chrome/common/extensions/webstore_install_result.h"
 #include "chrome/common/web_application_info.h"
 #include "ipc/ipc_message_macros.h"
 
@@ -16,6 +17,8 @@
 
 IPC_ENUM_TRAITS_MAX_VALUE(extensions::api::webstore::InstallStage,
                           extensions::api::webstore::INSTALL_STAGE_INSTALLING)
+IPC_ENUM_TRAITS_MAX_VALUE(extensions::webstore_install::Result,
+                          extensions::webstore_install::RESULT_LAST)
 
 IPC_STRUCT_TRAITS_BEGIN(WebApplicationInfo::IconInfo)
   IPC_STRUCT_TRAITS_MEMBER(url)
@@ -57,10 +60,11 @@ IPC_MESSAGE_ROUTED1(ExtensionMsg_InlineInstallDownloadProgress,
 
 // Send to renderer once the installation mentioned on
 // ExtensionHostMsg_InlineWebstoreInstall is complete.
-IPC_MESSAGE_ROUTED3(ExtensionMsg_InlineWebstoreInstallResponse,
+IPC_MESSAGE_ROUTED4(ExtensionMsg_InlineWebstoreInstallResponse,
                     int32 /* install id */,
                     bool /* whether the install was successful */,
-                    std::string /* error */)
+                    std::string /* error */,
+                    extensions::webstore_install::Result /* result */)
 
 // Messages sent from the renderer to the browser.