Make service tab launcher a component

chrome/browser/android/service_tab_launcher.h

-// 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.
-
-#ifndef CHROME_BROWSER_ANDROID_SERVICE_TAB_LAUNCHER_H_
-#define CHROME_BROWSER_ANDROID_SERVICE_TAB_LAUNCHER_H_
-
-#include "base/android/jni_android.h"
-#include "base/callback_forward.h"
-#include "base/id_map.h"
-#include "base/memory/singleton.h"
-
-namespace content {
-class BrowserContext;
-struct OpenURLParams;
-class WebContents;
-}
-
-namespace chrome {
-namespace android {
-
-// Launcher for creating new tabs on Android from a background service, where
-// there may not necessarily be an Activity or a tab model at all. When the
-// tab has been launched, the user of this class will be informed with the
-// content::WebContents instance associated with the tab.
-class ServiceTabLauncher {
-  using TabLaunchedCallback = base::Callback<void(content::WebContents*)>;
-
- public:
-  // Returns the singleton instance of the service tab launcher.
-  static ServiceTabLauncher* GetInstance();
-
-  // Launches a new tab when we're in a Service rather than in an Activity.
-  // |callback| will be invoked with the resulting content::WebContents* when
-  // the tab is avialable. This method must only be called from the UI thread.
-  void LaunchTab(content::BrowserContext* browser_context,
-                 const content::OpenURLParams& params,
-                 const TabLaunchedCallback& callback);
-
-  // To be called when the tab for |request_id| has launched, with the
-  // associated |web_contents|. The WebContents must not yet have started
-  // the provisional load for the main frame of the navigation.
-  void OnTabLaunched(int request_id, content::WebContents* web_contents);
-
-  static bool RegisterServiceTabLauncher(JNIEnv* env);
-
- private:
-  friend struct DefaultSingletonTraits<ServiceTabLauncher>;
-
-  ServiceTabLauncher();
-  ~ServiceTabLauncher();
-
-  IDMap<TabLaunchedCallback> tab_launched_callbacks_;
-
-  base::android::ScopedJavaGlobalRef<jobject> java_object_;
-
-  DISALLOW_COPY_AND_ASSIGN(ServiceTabLauncher);
-};
-
-}  // namespace android
-}  // namespace chrome
-
-#endif  // CHROME_BROWSER_ANDROID_SERVICE_TAB_LAUNCHER_H_