Make URLRequestContextAdapter initialization asynchronous

components/cronet/android/url_request_context_adapter.h

Index: components/cronet/android/url_request_context_adapter.h
diff --git a/components/cronet/android/url_request_context_adapter.h b/components/cronet/android/url_request_context_adapter.h
index 1bb2e70632d377b7366450f1e6f984c4a11e1b4d..48ff139d8ac74dcfd23b2fcc7794ccdd215256f0 100644
--- a/components/cronet/android/url_request_context_adapter.h
+++ b/components/cronet/android/url_request_context_adapter.h
@@ -5,8 +5,10 @@
 #ifndef COMPONENTS_CRONET_ANDROID_URL_REQUEST_CONTEXT_ADAPTER_H_
 #define COMPONENTS_CRONET_ANDROID_URL_REQUEST_CONTEXT_ADAPTER_H_
 
+#include <queue>
 #include <string>
 
+#include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ -24,6 +26,7 @@ class NetLogLogger;
 namespace cronet {
 
 struct URLRequestContextConfig;
+typedef base::Callback<void()> RunAfterContextInitTask;
 
 // Implementation of the Chromium NetLog observer interface.
 class NetLogObserver : public net::NetLog::ThreadSafeObserver {
@@ -56,6 +59,10 @@ class URLRequestContextAdapter : public net::URLRequestContextGetter {
                            std::string user_agent);
   void Initialize(scoped_ptr<URLRequestContextConfig> config);
 
+  // Runs a task that might depend on context being initialized.
+  void RunTask(const RunAfterContextInitTask& callback);

[mmenke, 2014/10/02 22:11:52]

Maybe RunTaskAfterContextInit?  It's a bit unwieldy, but makes it clearer what's
going on at callsites, where the callback's type is less obvious.  Same for the
next method.

[xunjieli, 2014/10/03 14:32:55]

Done.

+  void RunTaskOnNetworkThread(const RunAfterContextInitTask& callback);
+
   const std::string& GetUserAgent(const GURL& url) const;
 
   // net::URLRequestContextGetter implementation:
@@ -75,6 +82,10 @@ class URLRequestContextAdapter : public net::URLRequestContextGetter {
   scoped_ptr<NetLogObserver> net_log_observer_;
   scoped_ptr<net::NetLogLogger> net_log_logger_;
 
+  // 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_;
+
   virtual ~URLRequestContextAdapter();
 
   // Initializes |context_| on the Network thread.