chromeos: Add NoteTakingHelper class.

chrome/browser/chromeos/note_taking_helper.cc

 // Copyright 2016 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 "chrome/browser/chromeos/note_taking_app_utils.h"
+#include "chrome/browser/chromeos/note_taking_helper.h"
 
 #include <string>
 #include <vector>
 
 #include "apps/launcher.h"
 #include "ash/common/system/chromeos/palette/palette_utils.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_split.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chromeos/chromeos_switches.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/common/api/app_runtime.h"
 #include "extensions/common/extension.h"
 #include "url/gurl.h"
 
 namespace app_runtime = extensions::api::app_runtime;
 
 namespace chromeos {
 namespace {
 
+// Pointer to singleton instance.
+NoteTakingHelper* g_helper = nullptr;
+
 // TODO(derat): Add more IDs.
 const char* const kExtensionIds[] = {
     // TODO(jdufault): Remove testing version after m54. See crbug.com/640828.
     "ogfjaccbdfhecploibfbhighmebiffla",  // Testing Keep app
     "hmjkmjkepdijhoojdojkdfohbdgmmhki",  // Google Keep app (Web Store)
 };
 
 // Returns the first installed and enabled whitelisted note-taking app, or null
 // if none is installed.
 const extensions::Extension* GetApp(Profile* profile) {
@@ skipping 22 matching lines @@
     if (enabled_extensions.Contains(id)) {
       return extension_registry->GetExtensionById(
           id, extensions::ExtensionRegistry::ENABLED);
     }
   }
   return nullptr;
 }
 
 }  // namespace
 
-bool IsNoteTakingAppAvailable(Profile* profile) {
+// static
+void NoteTakingHelper::Initialize() {
+  DCHECK(!g_helper);
+  g_helper = new NoteTakingHelper();
+}
+
+// static
+void NoteTakingHelper::Shutdown() {
+  DCHECK(g_helper);
+  delete g_helper;
+  g_helper = nullptr;
+}
+
+// static
+NoteTakingHelper* NoteTakingHelper::Get() {
+  DCHECK(g_helper);
+  return g_helper;
+}
+
+bool NoteTakingHelper::IsAppAvailable(Profile* profile) {
   DCHECK(profile);
   return ash::IsPaletteFeatureEnabled() && GetApp(profile);
 }
 
-void LaunchNoteTakingAppForNewNote(Profile* profile,
-                                   const base::FilePath& path) {
+void NoteTakingHelper::LaunchAppForNewNote(Profile* profile,
+                                           const base::FilePath& path) {
   DCHECK(profile);
   const extensions::Extension* app = GetApp(profile);
   if (!app) {
     LOG(ERROR) << "Failed to find note-taking app";
     return;
   }
 
   auto action_data = base::MakeUnique<app_runtime::ActionData>();
   action_data->action_type = app_runtime::ActionType::ACTION_TYPE_NEW_NOTE;
   apps::LaunchPlatformAppWithAction(profile, app, std::move(action_data), path);
 }
 
+NoteTakingHelper::NoteTakingHelper() {}
+
+NoteTakingHelper::~NoteTakingHelper() {}
+
 }  // namespace chromeos