QUIC - histograms to measure the time spent to read QUIC sever

net/quic/crypto/quic_server_info.h

Index: net/quic/crypto/quic_server_info.h
diff --git a/net/quic/crypto/quic_server_info.h b/net/quic/crypto/quic_server_info.h
index 853504ae70f96882c3d1d5e66165097892554dc3..4b47511e79cb183a9183274ba6e0fe935d8c1051 100644
--- a/net/quic/crypto/quic_server_info.h
+++ b/net/quic/crypto/quic_server_info.h
@@ -55,6 +55,13 @@ class NET_EXPORT_PRIVATE QuicServerInfo {
   // callback.
   virtual void Persist() = 0;
 
+  // Helper methods used for computing time spent to read QUIC server
+  // information from disk cache.
+  const base::TimeTicks& read_start_time() const { return read_start_time_; }
+  void set_read_start_time(const base::TimeTicks& request_time) {
+    read_start_time_ = request_time;
+  }
+
   struct State {
     State();
     ~State();
@@ -94,6 +101,10 @@ class NET_EXPORT_PRIVATE QuicServerInfo {
 
   // This is the QUIC server hostname for which we restore the crypto_config.
   const std::string hostname_;
+
+  // Time when call to WaitForDataReady was made, used for computing time spent
+  // to read QUIC server information from disk cache.
+  base::TimeTicks read_start_time_;
 };
 
 class QuicServerInfoFactory {