[Cronet] Hook up library loader, system proxy and network change notifier to async api.

components/cronet/android/cronet_loader.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 <jni.h>
+
 #include "base/android/base_jni_registrar.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_registrar.h"
 #include "base/at_exit.h"
+#include "base/logging.h"
+#include "base/message_loop/message_loop.h"
 #include "components/cronet/android/chromium_url_request.h"
 #include "components/cronet/android/chromium_url_request_context.h"
 #include "components/cronet/android/cronet_url_request.h"
 #include "components/cronet/android/cronet_url_request_context.h"
 #include "components/cronet/android/histogram_manager.h"
+#include "jni/CronetLibraryLoader_jni.h"
 #include "net/android/net_jni_registrar.h"
+#include "net/android/network_change_notifier_factory_android.h"
+#include "net/base/network_change_notifier.h"
 #include "url/android/url_jni_registrar.h"
 #include "url/url_util.h"
 
 #if !defined(USE_ICU_ALTERNATIVES_ON_ANDROID)
 #include "base/i18n/icu_util.h"
 #endif
 
 namespace cronet {
 namespace {
 
 const base::android::RegistrationMethod kCronetRegisteredMethods[] = {
     {"BaseAndroid", base::android::RegisterJni},
-    {"ChromiumUrlRequest", cronet::ChromiumUrlRequestRegisterJni},
-    {"ChromiumUrlRequestContext", cronet::ChromiumUrlRequestContextRegisterJni},
-    {"CronetUrlRequest", cronet::CronetUrlRequestRegisterJni},
-    {"CronetUrlRequestContext", cronet::CronetUrlRequestContextRegisterJni},
-    {"HistogramManager", cronet::HistogramManagerRegisterJni},
+    {"ChromiumUrlRequest", ChromiumUrlRequestRegisterJni},
+    {"ChromiumUrlRequestContext", ChromiumUrlRequestContextRegisterJni},
+    {"CronetLibraryLoader", RegisterNativesImpl},
+    {"CronetUrlRequest", CronetUrlRequestRegisterJni},
+    {"CronetUrlRequestContext", CronetUrlRequestContextRegisterJni},
+    {"HistogramManager", HistogramManagerRegisterJni},
     {"NetAndroid", net::android::RegisterJni},
     {"UrlAndroid", url::android::RegisterJni},
 };
 
 base::AtExitManager* g_at_exit_manager = NULL;
+// MessageLoop on the main thread, which is where objects that receive Java
+// notifications generally live.
+base::MessageLoop* g_main_message_loop = nullptr;
+
+net::NetworkChangeNotifier* g_network_change_notifier = nullptr;
 
 }  // namespace
 
 // Checks the available version of JNI. Also, caches Java reflection artifacts.
 jint CronetOnLoad(JavaVM* vm, void* reserved) {
   JNIEnv* env;
   if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
     return -1;
   }
 
   base::android::InitVM(vm);
 
   if (!base::android::RegisterNativeMethods(
           env, kCronetRegisteredMethods, arraysize(kCronetRegisteredMethods))) {
     return -1;
   }
 
   g_at_exit_manager = new base::AtExitManager();
 
-#if !defined(USE_ICU_ALTERNATIVES_ON_ANDROID)
-  base::i18n::InitializeICU();
-#endif
-
   url::Initialize();
 
   return JNI_VERSION_1_6;
 }
 
 void CronetOnUnLoad(JavaVM* jvm, void* reserved) {
   if (g_at_exit_manager) {
     delete g_at_exit_manager;
     g_at_exit_manager = NULL;
   }
 }
 
+jlong CronetInitOnMainThread(JNIEnv* env, jclass jcaller, jobject jcontext) {
+  // Set application context.
+  base::android::ScopedJavaLocalRef<jobject> scoped_context(env, jcontext);
+  base::android::InitApplicationContext(env, scoped_context);
+
+#if !defined(USE_ICU_ALTERNATIVES_ON_ANDROID)
+  base::i18n::InitializeICU();
+#endif
+
+  DCHECK(!base::MessageLoop::current());
+  DCHECK(!g_main_message_loop);
+  g_main_message_loop = new base::MessageLoopForUI();
+  base::MessageLoopForUI::current()->Start();
+  DCHECK(!g_network_change_notifier);
+  net::NetworkChangeNotifier::SetFactory(
+      new net::NetworkChangeNotifierFactoryAndroid());
+  g_network_change_notifier = net::NetworkChangeNotifier::Create();
+
+  return 0;
+}
+
 }  // namespace cronet