Adds a new class HttpCache::Writers for multiple cache transactions reading from the network.

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 e420c7244204874988b4908149bf51a2bd8697a3..6b148f156d4a56c385c210f3cd65a5d1e4b2ced5 100644
--- a/net/http/http_cache.h
+++ b/net/http/http_cache.h
@@ -68,6 +68,8 @@ class NET_EXPORT HttpCache : public HttpTransactionFactory {
     DISABLE
   };
 
+  // class WritersTest;

[jkarlin, 2017/06/28 15:50:08]

What's this?

[shivanisha, 2017/06/28 19:38:19]

Removed in a subsequent patch.

+
   // A BackendFactory creates a backend object to be used by the HttpCache.
   class NET_EXPORT BackendFactory {
    public:
@@ -246,6 +248,9 @@ class NET_EXPORT HttpCache : public HttpTransactionFactory {
   class QuicServerInfoFactoryAdaptor;
   class Transaction;
   class WorkItem;
+  class Writers;
+  friend class WritersTest;   // To access ActiveEntry in the test class.
+  friend class WritersTest1;  // To access ActiveEntry in the test class.

[jkarlin, 2017/06/28 15:50:08]

What's this?

[shivanisha, 2017/06/28 19:38:19]

Removed in a subsequent patch.

   friend class Transaction;
   friend class ViewCacheHelper;
   struct PendingOp;  // Info for an entry under construction.