QUIC - disable QUIC under recent pathological connection errors.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index a96e994d642d164532ea795b2440dc2a7e53abec..55768f23478fdd7f4a02085ddd4c1cdf7d6cf0a0 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -22607,6 +22607,27 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Net.QuicStreamFactory.DisabledReasons"
+    enum="QuicDisabledReason">
+  <owner>ckrasic@chromium.org</owner>
+  <summary>
+    Rrecords reasons QUIC is disabled (for all ports), if sufficent recent
+    connections experience: public reset post crypto handshake, or timeouts with
+    streams open.  QUIC is disabled until the next reboot of Chrome.  Logged
+    during session close.
+  </summary>
+</histogram>
+
+<histogram name="Net.QuicStreamFactory.PublicResetsPostHandshake" units="count">

[Alexei Svitkine (slow), 2015/07/07 18:44:09]

Nit: Wouldn't units="resets" make more sense?

[Buck, 2015/07/07 18:55:20]

Done.

+  <owner>ckrasic@chromium.org</owner>
+  <summary>
+    Captures the maximum number of public resets post handshake that occurred
+    within a window of recent connections (default 20). Will help inform the
+    choice of threshold to disable QUIC for clients that experience pathalogical
+    errors.  Logged during session close.
+  </summary>
+</histogram>
+
 <histogram name="Net.QuicStreamFactory.QuicIsDisabled" enum="Ports">
   <owner>rtenneti@chromium.org</owner>
   <summary>
@@ -22616,6 +22637,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Net.QuicStreamFactory.TimeoutsWithOpenStreams" units="count">

[Alexei Svitkine (slow), 2015/07/07 18:44:09]

units="timeouts"?

[Buck, 2015/07/07 18:55:20]

Done.

+  <owner>ckrasic@chromium.org</owner>
+  <summary>
+    Captures the maximum number of connection timeouts with   streams open that

[Alexei Svitkine (slow), 2015/07/07 18:44:09]

Nit: You still have randomly doubled spaces in this description.

[Buck, 2015/07/07 18:55:20]

yikes, sorry I missed it! Done.

+    occurred within a window of recent connections   (default 20).  Will help
+    inform the choice of threshold to disable   QUIC for clients that experience
+    pathalogical errors. Logged during session close.
+  </summary>
+</histogram>
+
 <histogram name="Net.QuicVerifyProofFailed.HandshakeConfirmed"
     enum="BooleanHandshakeConfirmed">
   <owner>rtenneti@chromium.org</owner>
@@ -65291,6 +65322,12 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="5" label="FIVE_PACKETS_LOST"/>
 </enum>
 
+<enum name="QuicDisabledReason" type="int">
+  <int value="1" label="Public reset post handshake"/>
+  <int value="2" label="Timeout with open streams"/>
+  <int value="3" label="Bad packet loss rate"/>
+</enum>
+
 <enum name="QuicDiskCacheAPICall" type="int">
   <int value="0" label="Start"/>
   <int value="1" label="WaitForDataReady"/>