Add reprioritization to socket pools.

net/http/http_stream_factory_impl_unittest.cc

Index: net/http/http_stream_factory_impl_unittest.cc
diff --git a/net/http/http_stream_factory_impl_unittest.cc b/net/http/http_stream_factory_impl_unittest.cc
index a33649090be28b3467eada923cb91343779cb0e5..d85da3713de608ac194c4ac72f3697384e948a54 100644
--- a/net/http/http_stream_factory_impl_unittest.cc
+++ b/net/http/http_stream_factory_impl_unittest.cc
@@ -1514,6 +1514,44 @@ TEST_F(HttpStreamFactoryTest, RequestHttpStream) {
   EXPECT_TRUE(waiter.used_proxy_info().is_direct());
 }
 
+// Test the race of SetPriority versus stream completion where SetPriority
+// may be called on an HttpStreamFactoryImpl::Job after the stream
+// has been created by the job.
+TEST_F(HttpStreamFactoryTest, ReprioritizeAfterStreamReceived) {
+  SpdySessionDependencies session_deps(ProxyService::CreateDirect());
+
+  StaticSocketDataProvider socket_data;
+  socket_data.set_connect_data(MockConnect(SYNCHRONOUS, OK));
+  session_deps.socket_factory->AddSocketDataProvider(&socket_data);
+
+  std::unique_ptr<HttpNetworkSession> session(
+      SpdySessionDependencies::SpdyCreateSession(&session_deps));
+
+  // Now request a stream.  It should succeed using the second proxy in the
+  // list.
+  HttpRequestInfo request_info;
+  request_info.method = "GET";
+  request_info.url = GURL("http://www.google.com");
+  request_info.load_flags = 0;
+
+  SSLConfig ssl_config;
+  StreamRequestWaiter waiter;
+  std::unique_ptr<HttpStreamRequest> request(
+      session->http_stream_factory()->RequestStream(
+          request_info, LOWEST, ssl_config, ssl_config, &waiter,
+          NetLogWithSource()));
+  EXPECT_FALSE(waiter.stream_done());
+
+  // Test to confirm that a SetPriority received after the stream is created
+  // does not crash.

[mmenke, 2017/01/18 20:37:26]

Hrm...Is there some way we can verify the stream was created?  Query the SPDY
session or something?  Grab the SpdySession and call num_active_streams()?

[Randy Smith (Not in Mondays), 2017/01/22 21:37:00]

I've modified the test to confirm that a session has been created synchronously
through the RequestStream().  I tried to test num_active_streams() and couldn't
get it to go non-zero; as best I can tell the SpdySession only creates a stream
on first write, and I don't think there's any way to arrange for a write before
the PostTask/upcall returning the stream occurs.  Let me know if you don't think
that's enough and/or if you see some way of testing to make sure a stream has
actually been created.

+  request->SetPriority(HIGHEST);
+
+  waiter.WaitForStream();
+  EXPECT_TRUE(waiter.stream_done());
+  ASSERT_TRUE(nullptr != waiter.stream());

[mmenke, 2017/01/18 20:37:26]

I believe you can ASSERT_TRUE(waiter.stream()); now.

[Randy Smith (Not in Mondays), 2017/01/22 21:37:00]

Done.

+  EXPECT_TRUE(nullptr == waiter.websocket_stream());

[mmenke, 2017/01/18 20:37:27]

Same as above (Except EXPECT_FALSE)

[Randy Smith (Not in Mondays), 2017/01/22 21:37:00]

Done.

+}
+
 TEST_F(HttpStreamFactoryTest, RequestHttpStreamOverSSL) {
   SpdySessionDependencies session_deps(ProxyService::CreateDirect());