Log app_shell warnings on loading apps

extensions/shell/browser/shell_extension_system.cc

 // Copyright 2014 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 "extensions/shell/browser/shell_extension_system.h"
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 38 matching lines @@
   int load_flags = Extension::FOLLOW_SYMLINKS_ANYWHERE;
   std::string load_error;
   scoped_refptr<Extension> extension = file_util::LoadExtension(
       app_dir, Manifest::COMMAND_LINE, load_flags, &load_error);
   if (!extension.get()) {
     LOG(ERROR) << "Loading extension at " << app_dir.value()
                << " failed with: " << load_error;
     return nullptr;
   }
 
+  // Log warnings.
+  if (extension->install_warnings().size()) {
+    LOG(WARNING) << "Warnings loading extension at " << app_dir.value() << ":";
+    for (const auto& warning : extension->install_warnings())
+      LOG(WARNING) << warning.message;
+  }
+
   // TODO(jamescook): We may want to do some of these things here:
   // * Create a PermissionsUpdater.
   // * Call PermissionsUpdater::GrantActivePermissions().
   // * Call ExtensionService::SatisfyImports().
   // * Call ExtensionPrefs::OnExtensionInstalled().
   // * Call ExtensionRegistryObserver::OnExtensionWillbeInstalled().
 
   ExtensionRegistry::Get(browser_context_)->AddEnabled(extension.get());
 
   RegisterExtensionWithRequestContexts(
@@ skipping 123 matching lines @@
 }
 
 void ShellExtensionSystem::OnExtensionRegisteredWithRequestContexts(
     scoped_refptr<Extension> extension) {
   ExtensionRegistry* registry = ExtensionRegistry::Get(browser_context_);
   registry->AddReady(extension);
   registry->TriggerOnReady(extension.get());
 }
 
 }  // namespace extensions