Allows deferral of a URLRequest just before talking to the network, at

net/http/http_cache_transaction.h

Index: net/http/http_cache_transaction.h
diff --git a/net/http/http_cache_transaction.h b/net/http/http_cache_transaction.h
index 9c69817f98c5c5dde45e1d62b5fb85316936c220..7bbad0755f7b72818cf5cc6a5f025575ebceea4c 100644
--- a/net/http/http_cache_transaction.h
+++ b/net/http/http_cache_transaction.h
@@ -131,7 +131,9 @@ class HttpCache::Transaction : public HttpTransaction {
   virtual void SetPriority(RequestPriority priority) OVERRIDE;
   virtual void SetWebSocketHandshakeStreamCreateHelper(
       net::WebSocketHandshakeStreamBase::CreateHelper* create_helper) OVERRIDE;
-
+  virtual void SetBeforeNetworkStartCallback(
+      const base::Callback<void(bool*)>& callback) OVERRIDE;

[mmenke, 2014/01/07 15:26:23]

Should make the callback a typedef with a comment on what the bool* is.

[jkarlin, 2014/01/07 16:19:32]

Done.

+  virtual int ResumeNetworkStart() OVERRIDE;
  private:

[mmenke, 2014/01/07 15:26:23]

nit:  Blank line before private.

[jkarlin, 2014/01/07 16:19:32]

Done.

   static const size_t kNumValidationHeaders = 2;
   // Helper struct to pair a header name with its value, for
@@ -438,6 +440,8 @@ class HttpCache::Transaction : public HttpTransaction {
   WebSocketHandshakeStreamBase::CreateHelper*
       websocket_handshake_stream_base_create_helper_;
 
+  base::Callback<void(bool*)> before_network_start_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(Transaction);
 };