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 18ec5e60d2720b284088f37d63fa53619511590e..04429b49734f785597aa9566c716d50b041ad851 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -107994,6 +107994,7 @@ 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">
@@ -108015,13 +108016,15 @@ 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">