Push API: Validate storage before returning cached subscriptions

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 784efedb963b777e5915785170e365c40ac93d89..5a89eb2358d6193075ff84ca3fbea728424f44c9 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -103884,6 +103884,7 @@ value.
   <int value="3" label="Registration not found"/>
   <int value="4" label="Registration not found (no incognito push service)"/>
   <int value="5" label="Unable to retrieve the public key"/>
+  <int value="6" label="Storage corrupt"/>
 </enum>
 
 <enum name="PushRegistrationStatus" type="int">
@@ -103905,13 +103906,15 @@ value.
 
 <enum name="PushUnregistrationReason" type="int">
   <int value="0" label="Unknown"/>
-  <int value="1" label="JavaScript API"/>
+  <int value="1" label="unsubscribe() JavaScript API"/>
   <int value="2" label="Permission revoked"/>
   <int value="3" label="Incoming message app id was unknown"/>
   <int value="4" label="Incoming message origin no longer has permission"/>
   <int value="5" label="Incoming message Service Worker not found"/>
   <int value="6" label="GCM Store reset due to corruption"/>
   <int value="7" label="Service Worker unregistered"/>
+  <int value="8" label="subscribe() storage corrupt"/>
+  <int value="9" label="getSubscription() storage corrupt"/>
 </enum>
 
 <enum name="PushUnregistrationStatus" type="int">