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

components/cronet/android/cronet_url_request_context_adapter.h

 // 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.
 
 #ifndef COMPONENTS_CRONET_ANDROID_CRONET_URL_REQUEST_CONTEXT_ADAPTER_H_
 #define COMPONENTS_CRONET_ANDROID_CRONET_URL_REQUEST_CONTEXT_ADAPTER_H_
 
 #include <jni.h>
 #include <stdint.h>
 
@@ skipping 40 matching lines @@
     : public net::NetworkQualityEstimator::EffectiveConnectionTypeObserver,
       public net::NetworkQualityEstimator::RTTAndThroughputEstimatesObserver,
       public net::NetworkQualityEstimator::RTTObserver,
       public net::NetworkQualityEstimator::ThroughputObserver {
  public:
   explicit CronetURLRequestContextAdapter(
       std::unique_ptr<URLRequestContextConfig> context_config);
 
   ~CronetURLRequestContextAdapter() override;
 
-  // Called on main Java thread to initialize URLRequestContext.
-  void InitRequestContextOnMainThread(
+  // Called on init Java thread to initialize URLRequestContext.
+  void InitRequestContextOnInitThread(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& jcaller);
 
   // Releases all resources for the request context and deletes the object.
   // Blocks until network thread is destroyed after running all pending tasks.
   void Destroy(JNIEnv* env,
                const base::android::JavaParamRef<jobject>& jcaller);
 
   // Posts a task that might depend on the context being initialized
   // to the network thread.
@@ skipping 27 matching lines @@
                   const base::android::JavaParamRef<jobject>& jcaller);
 
   // Posts a task to Network thread to get serialized results of certificate
   // verifications of |context_|'s |cert_verifier|.
   void GetCertVerifierData(JNIEnv* env,
                            const base::android::JavaParamRef<jobject>& jcaller);
 
   // Default net::LOAD flags used to create requests.
   int default_load_flags() const { return default_load_flags_; }
 
-  // Called on main Java thread to initialize URLRequestContext.
-  void InitRequestContextOnMainThread();
+  // Called on init Java thread to initialize URLRequestContext.
+  void InitRequestContextOnInitThread();
 
   // Configures the network quality estimator to observe requests to localhost,
   // to use smaller responses when estimating throughput, and to disable the
   // device offline checks when computing the effective connection type or when
   // writing the prefs. This should only be used for testing. This can be
   // called only after the network quality estimator has been enabled.
   void ConfigureNetworkQualityEstimatorForTesting(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& jcaller,
       jboolean use_local_host_requests,
@@ skipping 128 matching lines @@
 
   // Java object that owns this CronetURLRequestContextAdapter.
   base::android::ScopedJavaGlobalRef<jobject> jcronet_url_request_context_;
 
   DISALLOW_COPY_AND_ASSIGN(CronetURLRequestContextAdapter);
 };
 
 }  // namespace cronet
 
 #endif  // COMPONENTS_CRONET_ANDROID_CRONET_URL_REQUEST_CONTEXT_ADAPTER_H_