Platform-specific prune state storage.

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 aafe865d69ff0ff81ba4c60b93fdaf19562a85ef..9d4fe68c4d6b0158a0b302bd148021251568a62b 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -22031,7 +22031,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <owner>bengr@chromium.org</owner>
   <summary>
     The difference between the size specified in the X-Original-Content-Length
-    header and the size of teh response body. This is zero if the
+    header and the size of the response body. This is zero if the
     X-Original-Content-Length header is not present in the response.
   </summary>
 </histogram>
@@ -38578,6 +38578,18 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="SBIRS.PSSDataStoreSize" units="bytes">
+  <owner>grt@google.com</owner>
+  <summary>
+    The size, in bytes, of data stored in the platform state store.

[jwd, 2015/08/28 15:28:59]

This sounds like it's the total size of the data in the store, but it looks like
it's actually the size of the data being stored (I don't know if there's a
difference for this). Can you update the wording a bit to make it clearer.

Can you also mention when it's being logged, i.e. on when data gets stored to
it.

[grt (UTC plus 2), 2015/08/28 20:20:44]

Done.

+  </summary>
+</histogram>
+
+<histogram name="SBIRS.PSSLoadResult" enum="PlatformStateStoreLoadResult">
+  <owner>grt@google.com</owner>
+  <summary>The result of loading data from the platform state store.</summary>
+</histogram>
+
 <histogram name="SBIRS.ReceivedIncident" enum="IncidentType">
   <owner>grt@google.com</owner>
   <summary>
@@ -67467,6 +67479,22 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="4" label="Database error"/>
 </enum>
 
+<enum name="PlatformStateStoreLoadResult" type="int">
+  <int value="0" label="SUCCESS"/>
+  <int value="1" label="CLEARED_DATA">
+    Platform data cleared for new profile.
+  </int>
+  <int value="2" label="CLEARED_NO_DATA">
+    Empty platform data cleared for new profile.
+  </int>
+  <int value="3" label="DATA_CLEAR_FAILED">
+    Failed to clear data for new profile.
+  </int>
+  <int value="4" label="OPEN_FAILED">Failed to open data store.</int>
+  <int value="5" label="READ_FAILED">Failed to read from data store.</int>
+  <int value="6" label="PARSE_ERROR">Data could not be parsed.</int>
+</enum>
+
 <enum name="PluginAvailabilityStatus" type="int">
   <int value="0" label="PLUGIN_NOT_REGISTERED"/>
   <int value="1" label="PLUGIN_AVAILABLE"/>