Quantify initial stability report edge cases.

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 6e39e7f210b0c3caae848a2da5c053faf580612e..5f10855cec45e1cc8e416aeb1e11afa8691102a4 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -57563,6 +57563,34 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Stability.InitialStabilityLog.DeferredCount" units="counts">
+  <owner>manzagop@chromium.org</owner>
+  <summary>
+    Number of times the initial stability log upload was deferred to the next
+    startup. This is logged during stability metric recording for the following
+    log sent.
+  </summary>
+</histogram>
+
+<histogram name="Stability.InitialStabilityLog.DiscardCount" units="counts">
+  <owner>manzagop@chromium.org</owner>
+  <summary>
+    Number of times stability data was discarded. This is accumulated since the

[Alexei Svitkine (slow), 2016/09/08 18:41:12]

This is not actually about the initial stability log. So the name of the metric
is kind of confusing.

How about instead of using InitialStabilityLog as the substring in the name,
instead doing something like "Internals"

i.e. Stability.Internals.DataDiscardCount

And for the one above Stability.Internals.InitialStabilityLogDeferredCount

[manzagop (departed), 2016/09/08 20:54:30]

Done.

+    last report, even across versions. This is logged during stability metric
+    recording for the following log sent.
+  </summary>
+</histogram>
+
+<histogram name="Stability.InitialStabilityLog.VersionMismatchCount"
+    units="counts">
+  <owner>manzagop@chromium.org</owner>
+  <summary>
+    Number of times the version number stored in prefs did not match the
+    serialized system profile version number. This is logged during stability
+    metric recording.
+  </summary>
+</histogram>
+
 <histogram name="Stability.MobileSessionShutdownType"
     enum="MobileSessionShutdownType">
   <owner>lpromero@chromium.org</owner>