[Cronet] Move initialization to a new thread rather than the UI thread.

components/cronet/android/cronet_url_request_context_adapter.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 "components/cronet/android/cronet_url_request_context_adapter.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 19 matching lines @@
 #include "base/memory/scoped_vector.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "components/cronet/android/cert/cert_verifier_cache_serializer.h"
 #include "components/cronet/android/cert/proto/cert_verification.pb.h"
+#include "components/cronet/android/cronet_library_loader.h"
 #include "components/cronet/histogram_manager.h"
 #include "components/cronet/url_request_context_config.h"
 #include "components/prefs/pref_change_registrar.h"
 #include "components/prefs/pref_filter.h"
 #include "components/prefs/pref_registry.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 #include "components/prefs/pref_service_factory.h"
 #include "jni/CronetUrlRequestContext_jni.h"
 #include "net/base/load_flags.h"
@@ skipping 31 matching lines @@
 const int kNumNetLogEventFiles = 10;
 
 // This class wraps a NetLog that also contains network change events.
 class NetLogWithNetworkChangeEvents {
  public:
   NetLogWithNetworkChangeEvents() {}
 
   net::NetLog* net_log() { return &net_log_; }
   // This function registers with the NetworkChangeNotifier and so must be
   // called *after* the NetworkChangeNotifier is created. Should only be
-  // called on the UI thread as it is not thread-safe and the UI thread is
+  // called on the init thread as it is not thread-safe and the init thread is
   // the thread the NetworkChangeNotifier is created on. This function is
   // not thread-safe because accesses to |net_change_logger_| are not atomic.
   // There might be multiple CronetEngines each with a network thread so
-  // so the UI thread is used. |g_net_log_| also outlives the network threads
+  // so the init thread is used. |g_net_log_| also outlives the network threads
   // so it would be unsafe to receive callbacks on the network threads without
   // a complicated thread-safe reference-counting system to control callback
   // registration.
-  void EnsureInitializedOnMainThread() {
-    DCHECK(base::MessageLoopForUI::IsCurrent());
+  void EnsureInitializedOnInitThread() {
+    DCHECK(cronet::OnInitThread());
     if (net_change_logger_)
       return;
     net_change_logger_.reset(new net::LoggingNetworkChangeObserver(&net_log_));
   }
 
  private:
   net::NetLog net_log_;
   // LoggingNetworkChangeObserver logs network change events to a NetLog.
   // This class bundles one LoggingNetworkChangeObserver with one NetLog,
   // so network change event are logged just once in the NetLog.
@@ skipping 390 matching lines @@
     network_quality_estimator_->RemoveRTTObserver(this);
     network_quality_estimator_->RemoveThroughputObserver(this);
     network_quality_estimator_->RemoveEffectiveConnectionTypeObserver(this);
     network_quality_estimator_->RemoveRTTAndThroughputEstimatesObserver(this);
   }
 
   // Stop NetLog observer if there is one.
   StopNetLogOnNetworkThread();
 }
 
-void CronetURLRequestContextAdapter::InitRequestContextOnMainThread(
+void CronetURLRequestContextAdapter::InitRequestContextOnInitThread(
     JNIEnv* env,
     const JavaParamRef<jobject>& jcaller) {
   base::android::ScopedJavaGlobalRef<jobject> jcaller_ref;
   jcaller_ref.Reset(env, jcaller);
   proxy_config_service_ = net::ProxyService::CreateSystemProxyConfigService(
       GetNetworkTaskRunner(), nullptr /* Ignored on Android */);
   net::ProxyConfigServiceAndroid* android_proxy_config_service =
       static_cast<net::ProxyConfigServiceAndroid*>(proxy_config_service_.get());
   // If a PAC URL is present, ignore it and use the address and port of
   // Android system's local HTTP proxy server. See: crbug.com/432539.
   // TODO(csharrison) Architect the wrapper better so we don't need to cast for
   // android ProxyConfigServices.
   android_proxy_config_service->set_exclude_pac_url(true);
-  g_net_log.Get().EnsureInitializedOnMainThread();
+  g_net_log.Get().EnsureInitializedOnInitThread();
   GetNetworkTaskRunner()->PostTask(
       FROM_HERE,
       base::Bind(&CronetURLRequestContextAdapter::InitializeOnNetworkThread,
                  base::Unretained(this), base::Passed(&context_config_),
                  jcaller_ref));
 }
 
 void CronetURLRequestContextAdapter::
     ConfigureNetworkQualityEstimatorOnNetworkThreadForTesting(
         bool use_local_host_requests,
@@ skipping 672 matching lines @@
     JNIEnv* env,
     const JavaParamRef<jclass>& jcaller) {
   base::StatisticsRecorder::Initialize();
   std::vector<uint8_t> data;
   if (!HistogramManager::GetInstance()->GetDeltas(&data))
     return ScopedJavaLocalRef<jbyteArray>();
   return base::android::ToJavaByteArray(env, &data[0], data.size());
 }
 
 }  // namespace cronet