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 dcfd699d45196af1e66b3cedaedac7dbc25d51d6..7124f344e3f94870c9aac18b677d5cfd0c7622eb 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -22040,7 +22040,7 @@ 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>
@@ -38587,6 +38587,19 @@ 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 a profile's platform state store. This hisogram is
+    logged on each write, which always replaces any previous contents.
+  </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>
@@ -67482,6 +67495,22 @@ 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"/>