Make URLRequestContextAdapter initialization asynchronous

components/cronet/android/url_request_context_adapter.cc

Index: components/cronet/android/url_request_context_adapter.cc
diff --git a/components/cronet/android/url_request_context_adapter.cc b/components/cronet/android/url_request_context_adapter.cc
index 00e463e7f83d0f3cefbb14abfe0891ed28366c08..a180344c46f8eabcf3bb4381c9e9e8926ff14207 100644
--- a/components/cronet/android/url_request_context_adapter.cc
+++ b/components/cronet/android/url_request_context_adapter.cc
@@ -178,6 +178,11 @@ void URLRequestContextAdapter::InitializeURLRequestContext(
           net::AlternateProtocol::QUIC,
           1.0f);
     }
+    is_context_initialized_ = true;
+    while (!tasks_.empty()) {
+      tasks_.front().Run();
+      tasks_.pop();
+    }
   }
 
   if (VLOG_IS_ON(2)) {
@@ -189,6 +194,26 @@ void URLRequestContextAdapter::InitializeURLRequestContext(
   delegate_->OnContextInitialized(this);
 }
 
+// Runs a task that might depend on the context being initialized.
+// This method can be called on any thread.
+void URLRequestContextAdapter::RunTask(
+    const RunAfterContextInitTask& callback) {
+  GetNetworkTaskRunner()->PostTask(
+      FROM_HERE,
+      base::Bind(
+          &URLRequestContextAdapter::RunTaskOnNetworkThread, this, callback));
+}
+
+// This method should only be run on the network thread.
+void URLRequestContextAdapter::RunTaskOnNetworkThread(
+    const RunAfterContextInitTask& callback) {
+  if (is_context_initialized_) {
+    callback.Run();
+    return;
+  }
+  tasks_.push(callback);
+}
+
 URLRequestContextAdapter::~URLRequestContextAdapter() {
   if (net_log_observer_) {
     context_->net_log()->RemoveThreadSafeObserver(net_log_observer_.get());