Introduce the PushSubscription.curve25519dh attribute (2/3)

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 8048c513b4a3942e22efba3172ec4b2047efe7f5..3e46b2beb9f06af045dbbecd45d0a7eaa7d2bc86 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -65347,6 +65347,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="2" label="Storage error"/>
   <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"/>
 </enum>
 
 <enum name="PushRegistrationStatus" type="int">
@@ -65361,6 +65362,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="8" label="Successful - from cache"/>
   <int value="9" label="Network error"/>
   <int value="10" label="Permission denied (no incognito push service)"/>
+  <int value="11" label="Unable to retrieve the public key"/>

[johnme, 2015/07/09 16:02:53]

Nit: Might want a more generic string to cover other possible errors, like
failing to persist the private key to GCMDriver's store?

[Peter Beverloo, 2015/07/09 18:54:17]

I think we'll want separate UMA for the GCMDriver store. Since Push will be the
first consumer, all data will be ours.

 </enum>
 
 <enum name="PushUnregistrationStatus" type="int">