Add field trial stats for alternate_protocol.

net/http/http_network_transaction_unittest.cc

Index: net/http/http_network_transaction_unittest.cc
===================================================================
--- net/http/http_network_transaction_unittest.cc	(revision 50874)
+++ net/http/http_network_transaction_unittest.cc	(working copy)
@@ -4926,6 +4926,7 @@
   EXPECT_EQ("HTTP/1.1 200 OK", response->headers->GetStatusLine());
   EXPECT_FALSE(response->was_fetched_via_spdy);
   EXPECT_FALSE(response->was_npn_negotiated);
+  EXPECT_FALSE(response->was_alternate_protocol_available);
 
   std::string response_data;
   ASSERT_EQ(OK, ReadTransaction(trans.get(), &response_data));
@@ -5195,6 +5196,7 @@
   EXPECT_EQ("HTTP/1.1 200 OK", response->headers->GetStatusLine());
   EXPECT_TRUE(response->was_fetched_via_spdy);
   EXPECT_TRUE(response->was_npn_negotiated);
+  EXPECT_TRUE(response->was_alternate_protocol_available);
 
   ASSERT_EQ(OK, ReadTransaction(trans.get(), &response_data));
   EXPECT_EQ("hello!", response_data);
@@ -5435,6 +5437,7 @@
   EXPECT_EQ("HTTP/1.1 200 OK", response->headers->GetStatusLine());
   EXPECT_TRUE(response->was_fetched_via_spdy);
   EXPECT_TRUE(response->was_npn_negotiated);
+  EXPECT_TRUE(response->was_alternate_protocol_available);
 
   ASSERT_EQ(OK, ReadTransaction(trans.get(), &response_data));
   EXPECT_EQ("hello!", response_data);
@@ -6092,6 +6095,7 @@
 
   EXPECT_FALSE(response->was_fetched_via_spdy);
   EXPECT_TRUE(response->was_npn_negotiated);
+  EXPECT_FALSE(response->was_alternate_protocol_available);
 
   HttpNetworkTransaction::SetNextProtos("");
   HttpNetworkTransaction::SetUseAlternateProtocols(false);