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

components/cronet/android/cronet_url_request_context_adapter.h

Index: components/cronet/android/cronet_url_request_context_adapter.h
diff --git a/components/cronet/android/cronet_url_request_context_adapter.h b/components/cronet/android/cronet_url_request_context_adapter.h
index 4444f156cca488e3c13023ec37d3d7238eb472bf..679b26406cb7952649ffcefe059017d4eb04a23a 100644
--- a/components/cronet/android/cronet_url_request_context_adapter.h
+++ b/components/cronet/android/cronet_url_request_context_adapter.h
@@ -22,11 +22,13 @@ class SingleThreadTaskRunner;
 namespace net {
 class NetLogLogger;
 class URLRequestContext;
+class ProxyConfigService;
 }  // namespace net
 
 namespace cronet {
 
 struct URLRequestContextConfig;
+typedef base::Callback<void(void)> RunAfterContextInitTask;
 
 // Adapter between Java CronetUrlRequestContext and net::URLRequestContext.
 class CronetURLRequestContextAdapter {
@@ -42,6 +44,11 @@ class CronetURLRequestContextAdapter {
   // Blocks until network thread is destroyed after running all pending tasks.
   void Destroy();
 
+  // Posts a task that might depend on the context being initialized
+  // to the network thread.
+  void PostTaskToNetworkThread(const tracked_objects::Location& posted_from,
+                               const RunAfterContextInitTask& callback);
+
   net::URLRequestContext* GetURLRequestContext();
 
   scoped_refptr<base::SingleThreadTaskRunner> GetNetworkTaskRunner() const;
@@ -50,12 +57,20 @@ class CronetURLRequestContextAdapter {
 
   void StopNetLog();
 
+  // Called on main Java thread to initialize URLRequestContext.
+  void InitRequestContextOnMainThread();
+
  private:
   // Network thread is owned by |this|, but is destroyed from java thread.
   base::Thread* network_thread_;
   // |net_log_logger_| and |context_| should only be accessed on network thread.
   scoped_ptr<net::NetLogLogger> net_log_logger_;
   scoped_ptr<net::URLRequestContext> context_;
+  scoped_ptr<net::ProxyConfigService> proxy_config_service_;
+
+  // A queue of tasks that need to be run after context has been initialized.
+  std::queue<RunAfterContextInitTask> tasks_waiting_for_context_;
+  bool is_context_initialized_ = false;
 
   // Initializes |context_| on the Network thread.
   void InitializeOnNetworkThread(
@@ -64,6 +79,11 @@ class CronetURLRequestContextAdapter {
   void StartNetLogToFileOnNetworkThread(const std::string& file_name);
   void StopNetLogOnNetworkThread();
 
+  // Runs a task that might depend on the context being initialized.
+  // This method should only be run on the network thread.
+  void RunTaskAfterContextInitOnNetworkThread(
+      const RunAfterContextInitTask& callback);
+
   DISALLOW_COPY_AND_ASSIGN(CronetURLRequestContextAdapter);
 };