Adds cache lock timeout handling after finishing headers phase.

net/http/http_cache.h

Index: net/http/http_cache.h
diff --git a/net/http/http_cache.h b/net/http/http_cache.h
index 91214c179f9fb27051873c40a331821b3198386e..50d457ca9b4f5659968efcc7574b0a73e5d30d33 100644
--- a/net/http/http_cache.h
+++ b/net/http/http_cache.h
@@ -195,6 +195,13 @@ class NET_EXPORT HttpCache : public HttpTransactionFactory {
   // and effectively bypass the cache lock whenever there is lock contention.
   void SimulateCacheLockTimeout() { bypass_lock_for_test_ = true; }
 
+  // Causes all transactions created after this point to simulate lock timeout
+  // and effectively bypass the cache lock whenever there is lock contention
+  // after the transaction has completed its headers phase.
+  void SimulateCacheLockTimeoutAfterHeaders() {

[Randy Smith (Not in Mondays), 2017/06/23 17:38:01]

nit: Can this method have a ForTesting suffix?  I think there are some automated
tools that make sure such methods are only called from test code.

[shivanisha, 2017/06/23 19:16:08]

Done for both this and the existing SimulateCacheLockTimeout method

+    bypass_lock_after_headers_for_test_ = true;
+  }
+
   // Causes all transactions created after this point to generate a failure
   // when attempting to conditionalize a network request.
   void FailConditionalizationForTest() {
@@ -513,6 +520,7 @@ class NET_EXPORT HttpCache : public HttpTransactionFactory {
   std::unique_ptr<BackendFactory> backend_factory_;
   bool building_backend_;
   bool bypass_lock_for_test_;
+  bool bypass_lock_after_headers_for_test_;
   bool fail_conditionalization_for_test_;
 
   Mode mode_;