D2MIOS: Add plumbing to query verified number and send SMS from growth server.

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 35b3c77107264ab91d2e3857942a0935bf1b0875..7fab31e2c13dcb01a7b2eb78192bd620bd7e7dcc 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -10058,6 +10058,23 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="DesktopIOSPromotion.OAuthTokenCompletion"
+    enum="BooleanSuccess">
+  <owner>justincohen@chromium.org</owner>
+  <summary>
+    Whether getting the OAuth token was successful for a desktop to ios
+    promotion query.
+  </summary>
+</histogram>
+
+<histogram name="DesktopIOSPromotion.OAuthTokenResponseCode" units="code">
+  <owner>justincohen@chromium.org</owner>
+  <summary>
+    HTTP Response code returned by the server when trying to fetch the OAuth
+    token for a desktop ios promotion query.
+  </summary>
+</histogram>
+
 <histogram name="DevTools.ActionTaken" enum="DevToolsAction">
   <owner>sergeyv@chromium.org</owner>
   <owner>vsevik@chromium.org</owner>