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 85deff569253978846efc8c229380616237bdcbd..bca1ad0c482ed21bfaaccb38d2474198766daae3 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -37387,6 +37387,18 @@ 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.
+  </summary>
+</histogram>
+
+<histogram name="SBIRS.PSSLoadResult" enum="PlatformStateStoreLoadResult">
+  <owner>grt@google.com</owner>
+  <summary>The result of loading data from teh platform state store.</summary>
+</histogram>
+
 <histogram name="SBIRS.ReceivedIncident" enum="IncidentType">
   <owner>grt@google.com</owner>
   <summary>
@@ -65297,6 +65309,22 @@ 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"/>