Factor the extension loading code out of AccessibilityManager

chrome/browser/chromeos/accessibility/accessibility_extension_loader.h

+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_EXTENSION_LOADER_H_
+#define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_EXTENSION_LOADER_H_
+
+#include "base/callback_forward.h"
+#include "base/files/file_path.h"
+#include "base/memory/weak_ptr.h"
+
+namespace content {
+class RenderViewHost;
+}
+
+class ExtensionService;
+class Profile;
+
+namespace chromeos {
+
+class AccessibilityExtensionLoader {

[David Tseng, 2016/08/11 22:22:13]

Please include a small description of the class.

+ public:
+  AccessibilityExtensionLoader(const std::string& extension_id,
+                               const base::FilePath& extension_path);
+  ~AccessibilityExtensionLoader();
+
+  void SetProfile(Profile* profile);
+  void Load(Profile* profile,
+            const std::string& init_script_str,
+            const base::Closure& done_cb);
+  void Unload();

[David Tseng, 2016/08/11 22:22:13]

I'm not entirely sure about the use of SetProfile here and the various places
where profile gets used as a param.

+  void LoadToUserScreen(const base::Closure& done_cb);
+  void LoadToLockScreen(const base::Closure& done_cb);
+  void InjectContentScript(content::RenderViewHost* render_view_host);
+
+  bool loaded_on_lock_screen() { return loaded_on_lock_screen_; }
+
+ private:
+  void InjectContentScriptAndCallback(ExtensionService* extension_service,
+                                      int render_process_id,
+                                      int render_view_id,
+                                      const base::Closure& done_cb);
+  void LoadExtension(Profile* profile,
+                     content::RenderViewHost* render_view_host,
+                     base::Closure done_cb);
+
+  void UnloadFromLockScreen();
+  void UnloadExtensionFromProfile(Profile* profile);
+
+  Profile* profile_;
+  std::string extension_id_;
+  base::FilePath extension_path_;
+  std::string init_script_str_;
+
+  // Profile which the extension is currently loaded to.
+  // If nullptr, it is not loaded to any profile.
+  bool loaded_on_lock_screen_;
+  bool loaded_on_user_screen_;
+
+  base::WeakPtrFactory<AccessibilityExtensionLoader> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(AccessibilityExtensionLoader);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_EXTENSION_LOADER_H_