Add new metrics descriptions.

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 3b58faabf4f253fd98bc20f55d0d22a595ac4cdf..22006f446085a0b11dcd3c29c6a57075bbdea2e7 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -9193,6 +9193,146 @@ other types of suffix sets.
   </summary>
 </histogram>
 
+<histogram name="Platform.DiskUsage.HighUserCount.Cache_Avg" units="KB">

[Alexei Svitkine (slow), 2013/07/23 19:49:04]

You can make these less verbose by using a fieldtrial construct in the XML file
to give all of these histograms a common prefix. See the example at the top of
histograms.xml.

[Denis Kuznetsov (DE-MUC), 2013/07/24 14:13:41]

I could not find ProfilePictureDownload using chrome code search, but I've used
the prefix.

+  <summary>
+    Average size of user's Cache directory. Device has more than 6 users. Logged
+    once a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.HighUserCount.Cache_Max" units="KB">
+  <summary>
+    Maximum size of user's Cache directory. Device has more than 6 users. Logged
+    once a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.HighUserCount.Downloads_Avg" units="KB">
+  <summary>
+    Average size of user's Cache directory. Device has more than 6 users. Logged
+    once a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.HighUserCount.Downloads_Max" units="KB">
+  <summary>
+    Maximum size of user's Cache directory. Device has more than 6 users. Logged
+    once a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.HighUserCount.GCache_Avg" units="KB">
+  <summary>
+    Average size of user's GCache directory. Device has more than 6 users.
+    Logged once a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.HighUserCount.GCache_Max" units="KB">
+  <summary>
+    Maximum size of user's GCache directory. Device has more than 6 users.
+    Logged once a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.LowUserCount.Cache_Avg" units="KB">
+  <summary>
+    Average size of user's Cache directory. Device has 1 to 3 users. Logged once
+    a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.LowUserCount.Cache_Max" units="KB">
+  <summary>
+    Maximum size of user's Cache directory. Device has 1 to 3 users. Logged once
+    a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.LowUserCount.Downloads_Avg" units="KB">
+  <summary>
+    Average size of user's Cache directory. Device has 1 to 3 users. Logged once
+    a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.LowUserCount.Downloads_Max" units="KB">
+  <summary>
+    Maximum size of user's Cache directory. Device has 1 to 3 users. Logged once
+    a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.LowUserCount.GCache_Avg" units="KB">
+  <summary>
+    Average size of user's GCache directory. Device has 1 to 3 users. Logged
+    once a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.LowUserCount.GCache_Max" units="KB">
+  <summary>
+    Maximum size of user's GCache directory. Device has 1 to 3 users. Logged
+    once a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.MediumUserCount.Cache_Avg" units="KB">
+  <summary>
+    Average size of user's Cache directory. Device has 4 to 6 users. Logged once
+    a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.MediumUserCount.Cache_Max" units="KB">
+  <summary>
+    Maximum size of user's Cache directory. Device has 4 to 6 users. Logged once
+    a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.MediumUserCount.Downloads_Avg" units="KB">
+  <summary>
+    Average size of user's Cache directory. Device has 4 to 6 users. Logged once
+    a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.MediumUserCount.Downloads_Max" units="KB">
+  <summary>
+    Maximum size of user's Cache directory. Device has 4 to 6 users. Logged once
+    a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.MediumUserCount.GCache_Avg" units="KB">
+  <summary>
+    Average size of user's GCache directory. Device has 4 to 6 users. Logged
+    once a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.MediumUserCount.GCache_Max" units="KB">
+  <summary>
+    Maximum size of user's GCache directory. Device has 4 to 6 users. Logged
+    once a day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.OldestUserOnDevice">
+  <summary>
+    Days since last login of the least recently user on device. Logged once a
+    day, if disk usage is high.
+  </summary>
+</histogram>
+
+<histogram name="Platform.DiskUsage.UsersOnDevice">
+  <summary>
+    Number of user home dirs on device. Logged once a day, if disk usage is
+    high.
+  </summary>
+</histogram>
+
 <histogram name="Platform.DiskUsageCache" units="KB">
   <summary>KB in use in the /cache filesystem tree. Logged once a day.</summary>
 </histogram>