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 c27b5379a70393f970f9a248aaa9d44ce345aa5e..364ae9424cc4c889073c7da813b82aacb687a7cb 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -22471,6 +22471,27 @@ 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>
+    Records 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.
+  </summary>
+</histogram>
+
+<histogram name="Net.QuicStreamFactory.PublicResetsPostHandshake">
+  \
+  <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.
+  </summary>
+</histogram>
+
 <histogram name="Net.QuicStreamFactory.QuicIsDisabled" enum="Ports">
   <owner>rtenneti@chromium.org</owner>
   <summary>
@@ -22480,6 +22501,17 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Net.QuicStreamFactory.TimeoutsWithOpenStreams">
+  \
+  <owner>ckrasic@chromium.org</owner>
+  <summary>
+    Captures the maximum number of connection timeouts with   streams open 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.
+  </summary>
+</histogram>
+
 <histogram name="Net.QuicVerifyProofFailed.HandshakeConfirmed"
     enum="BooleanHandshakeConfirmed">
   <owner>rtenneti@chromium.org</owner>
@@ -64994,6 +65026,12 @@ 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"/>