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 72d58a4c0da5ee86f24467f740fa240fff893433..bd6394c45a806f7a1e60986bd745b38e709ff457 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -107689,6 +107689,7 @@ from previous Chrome versions.
   <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">
@@ -107710,13 +107711,15 @@ from previous Chrome versions.
 
 <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">