arc: Fix Default icon issue when cached icon file is corrupted.

components/arc/test/fake_app_instance.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/arc/test/fake_app_instance.h"
 
 #include <stdint.h>
 
 #include <string>
 #include <utility>
@@ skipping 101 matching lines @@
     return false;
   }
 
   app_host_->OnAppIcon(app.package_name, app.activity, scale_factor,
                        std::vector<uint8_t>(png_data_as_string->begin(),
                                             png_data_as_string->end()));
 
   return true;
 }
 
+void FakeAppInstance::GenerateAndSendBadIcon(const mojom::AppInfo& app,
+                                             mojom::ScaleFactor scale_factor,
+                                             std::string* png_data_as_string) {
+  std::vector<uint8_t> badIcon(10, 1);
+  app_host_->OnAppIcon(app.package_name, app.activity, scale_factor, badIcon);
+}
+
 bool FakeAppInstance::GetFakeIcon(mojom::ScaleFactor scale_factor,
                                   std::string* png_data_as_string) {
   CHECK(png_data_as_string != nullptr);
   std::string icon_file_name;
   switch (scale_factor) {
     case mojom::ScaleFactor::SCALE_FACTOR_100P:
       icon_file_name = "icon_100p.png";
       break;
     case mojom::ScaleFactor::SCALE_FACTOR_125P:
       icon_file_name = "icon_125p.png";
@@ skipping 130 matching lines @@
   std::string png_data_as_string;
   if (GetFakeIcon(scale_factor, &png_data_as_string)) {
     callback.Run(std::vector<uint8_t>(png_data_as_string.begin(),
                                       png_data_as_string.end()));
   }
 }
 
 void FakeAppInstance::RemoveCachedIcon(const std::string& icon_resource_id) {}
 
 }  // namespace arc