[Background Sync] Use GcmNetworkManager to start the browser for sync events.

content/browser/android/background_sync_launcher_android.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 "content/browser/android/background_sync_launcher_android.h"
-
-#include "content/public/browser/browser_thread.h"
-#include "jni/BackgroundSyncLauncher_jni.h"
-
-namespace content {
-
-namespace {
-base::LazyInstance<BackgroundSyncLauncherAndroid> g_background_sync_launcher =
-    LAZY_INSTANCE_INITIALIZER;
-}
-
-// static
-BackgroundSyncLauncherAndroid* BackgroundSyncLauncherAndroid::Get() {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-
-  return g_background_sync_launcher.Pointer();
-}
-
-// static
-void BackgroundSyncLauncherAndroid::LaunchBrowserWhenNextOnline(
-    const BackgroundSyncManager* registrant,
-    bool launch_when_next_online) {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-
-  Get()->LaunchBrowserWhenNextOnlineImpl(registrant, launch_when_next_online);
-}
-
-void BackgroundSyncLauncherAndroid::LaunchBrowserWhenNextOnlineImpl(
-    const BackgroundSyncManager* registrant,
-    bool launch_when_next_online) {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-
-  bool was_launching = !launch_when_next_online_registrants_.empty();
-
-  if (launch_when_next_online)
-    launch_when_next_online_registrants_.insert(registrant);
-  else
-    launch_when_next_online_registrants_.erase(registrant);
-
-  bool now_launching = !launch_when_next_online_registrants_.empty();
-  if (was_launching != now_launching) {
-    JNIEnv* env = base::android::AttachCurrentThread();
-    Java_BackgroundSyncLauncher_setLaunchWhenNextOnline(
-        env, java_launcher_.obj(), base::android::GetApplicationContext(),
-        now_launching);
-  }
-}
-
-// static
-bool BackgroundSyncLauncherAndroid::RegisterLauncher(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
-BackgroundSyncLauncherAndroid::BackgroundSyncLauncherAndroid() {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-
-  JNIEnv* env = base::android::AttachCurrentThread();
-  java_launcher_.Reset(Java_BackgroundSyncLauncher_create(
-      env, base::android::GetApplicationContext()));
-}
-
-BackgroundSyncLauncherAndroid::~BackgroundSyncLauncherAndroid() {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-
-  JNIEnv* env = base::android::AttachCurrentThread();
-  Java_BackgroundSyncLauncher_destroy(env, java_launcher_.obj());
-}
-
-}  // namespace content