Introduce a stable set of errors for inline install

chrome/renderer/extensions/webstore_bindings.cc

Index: chrome/renderer/extensions/webstore_bindings.cc
diff --git a/chrome/renderer/extensions/webstore_bindings.cc b/chrome/renderer/extensions/webstore_bindings.cc
index 4ceee5e8abf46ea0acb5b80cdea335d453e91317..2c2f06a2de7ebce71f4ead251523b63f8ebfc780 100644
--- a/chrome/renderer/extensions/webstore_bindings.cc
+++ b/chrome/renderer/extensions/webstore_bindings.cc
@@ -202,14 +202,17 @@ bool WebstoreBindings::OnMessageReceived(const IPC::Message& message) {
 void WebstoreBindings::OnInlineWebstoreInstallResponse(
     int install_id,
     bool success,
-    const std::string& error) {
+    const std::string& error,
+    webstore_install::Result result) {
   v8::Isolate* isolate = context()->isolate();
   v8::HandleScope handle_scope(isolate);
   v8::Context::Scope context_scope(context()->v8_context());
   v8::Handle<v8::Value> argv[] = {
     v8::Integer::New(isolate, install_id),
     v8::Boolean::New(isolate, success),
-    v8::String::NewFromUtf8(isolate, error.c_str())
+    v8::String::NewFromUtf8(isolate, error.c_str()),
+    v8::String::NewFromUtf8(
+        isolate, api::webstore::kInstallResultCodes[static_cast<int>(result)])
   };
   context()->module_system()->CallModuleMethod(
       "webstore", "onInstallResponse", arraysize(argv), argv);