Add a new enable_nonblocking_io field trial param for QUIC

chrome/browser/io_thread.h

Index: chrome/browser/io_thread.h
diff --git a/chrome/browser/io_thread.h b/chrome/browser/io_thread.h
index 10a9ad9de6f99f5e3ebe01daaf286e500911d351..b6717b7edba649e3563d0a82f2443a04b7726d85 100644
--- a/chrome/browser/io_thread.h
+++ b/chrome/browser/io_thread.h
@@ -190,6 +190,7 @@ class IOThread : public content::BrowserThreadDelegate {
     Optional<float> quic_load_server_info_timeout_srtt_multiplier;
     Optional<bool> quic_enable_truncated_connection_ids;
     Optional<bool> quic_enable_connection_racing;
+    Optional<bool> quic_enable_nonblocking_io;

[ramant (doing other things), 2015/02/27 23:03:29]

nit: consider "quic_enable_nonblocking_io" -> "quic_enable_non_blocking_io" to
be consistent with other code. It is your call.

https://code.google.com/p/chromium/codesearch#chromium/src/net/socket/tcp_soc...

[Ryan Hamilton, 2015/02/27 23:07:26]

Done.

     Optional<bool> quic_disable_disk_cache;
     Optional<size_t> quic_max_packet_length;
     net::QuicTagVector quic_connection_options;
@@ -384,6 +385,10 @@ class IOThread : public content::BrowserThreadDelegate {
   static bool ShouldQuicEnableConnectionRacing(
       const VariationParameters& quic_trial_params);
 
+  // Returns true if QUIC's should use non-blocking IO.
+  static bool ShouldQuicEnableNonblockingIO(

[ramant (doing other things), 2015/02/27 23:03:29]

nit: "ShouldQuicEnableNonblockingIO" -> "ShouldQuicEnableNonBlockingIO" to
be consistent with other code. It is your call.

https://code.google.com/p/chromium/codesearch#chromium/src/net/udp/udp_socket...

[Ryan Hamilton, 2015/02/27 23:07:26]

Done.

+      const VariationParameters& quic_trial_params);
+
   // Returns true if QUIC shouldn't load QUIC server information from the disk
   // cache.
   static bool ShouldQuicDisableDiskCache(