[Autofill Assistant] Displays error message on service error.

The default error message is displayed, when there is communication
problem.

Bug: 806868
Change-Id: Ic08594ce1b15535858b05d81406a5edac51150b5
Reviewed-on: https://chromium-review.googlesource.com/c/1256743
Commit-Queue: Lukasz Suder <lsuder@google.com>
Reviewed-by: Jungshik Shin <jshin@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601555}

components/autofill_assistant/browser/BUILD.gn

@@ -83,6 +83,7 @@ jumbo_static_library("browser") {
     "//components/autofill/core/browser",
     "//components/autofill/core/common",
     "//components/autofill_assistant/browser/devtools",
+    "//components/strings:components_strings_grit",
     "//components/version_info",
     "//content/public/browser",
     "//google_apis",

components/autofill_assistant/browser/DEPS

@@ -4,9 +4,11 @@ include_rules = [
   "+content/public/browser",
   "+content/public/test",
   "+content/shell/browser/shell.h",
+  "+components/strings/grit/components_strings.h",
   "+google_apis",
   "+net",
   "+services/network/public/cpp",
   "+third_party/blink/public/mojom/payments/payment_request.mojom.h",
   "+third_party/re2",
+  "+ui/base/l10n/l10n_util.h",
 ]

components/autofill_assistant/browser/controller.cc

@@ -9,10 +9,12 @@
 #include "base/task/post_task.h"
 #include "components/autofill_assistant/browser/protocol_utils.h"
 #include "components/autofill_assistant/browser/ui_controller.h"
+#include "components/strings/grit/components_strings.h"
 #include "content/public/browser/browser_task_traits.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
+#include "ui/base/l10n/l10n_util.h"
 #include "url/gurl.h"
 
 namespace autofill_assistant {
@@ -191,7 +193,9 @@ void Controller::OnScriptExecuted(const std::string& script_path,
   GetUiController()->HideOverlay();
   if (!result.success) {
     LOG(ERROR) << "Failed to execute script " << script_path;
-    // TODO(crbug.com/806868): Handle script execution failure.
+    GetUiController()->ShowStatusMessage(
+        l10n_util::GetStringUTF8(IDS_AUTOFILL_ASSISTANT_DEFAULT_ERROR));
+    return;
   }
 
   switch (result.at_end) {

components/autofill_assistant_strings.grdp

+<?xml version="1.0" encoding="utf-8"?>
+<grit-part>
+  <if expr="is_android">
+    <message name="IDS_AUTOFILL_ASSISTANT_DEFAULT_ERROR" desc="Text label that is shown when communication with server fails.">
+      Service is not available. Try again later.
+    </message>
+  </if>
+</grit-part>

components/components_strings.grd

@@ -184,6 +184,7 @@
     <messages fallback_to_english="true">
       <part file="app_modal_strings.grdp" />
       <part file="autofill_strings.grdp" />
+      <part file="autofill_assistant_strings.grdp" />
       <part file="bookmark_bar_strings.grdp" />
       <part file="bookmark_component_strings.grdp" />
       <part file="browsing_data_strings.grdp" />