Add Desktop iOS promotion logging to chrome ios app.

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 bfabea4f159f7878e7d44a9c4c6f01d83443c727..7bda9a18dce5930b6b019a7d52deb677bf78b3d6 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -9912,6 +9912,34 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="DesktopIOSPromotion.IOSSigninReason"
+    enum="DesktopIOSPromotionEntryPoint">
+  <owner>mrefaat@chromium.org</owner>
+  <summary>
+    [IOS] For users who sign-in on Chrome for iOS, log the type of the desktop
+    iOS promotions that was shown to the user. Only recorded if the user has
+    seen at least one desktop iOS promotion in the last 7 days and is signing
+    into chrome on iOS. The last promotion entry point that sent an SMS (if any)
+    is logged as DesktopIOSPromot.SMSSent.IOSSigninReason; all other promotions
+    that the user has seen are logged as
+    DesktopIOSPromotion.NoSMS.IOSSigninReason.
+  </summary>
+</histogram>
+
+<histogram name="DesktopIOSPromotion.SMSToSigninTime" units="hours">
+  <owner>mrefaat@chromium.org</owner>
+  <summary>
+    [IOS] The difference between the client time of triggering the SMS action on
+    a specific entry point promotion on desktop and client time of signing in
+    Chrome iOS app. This will only be logged if at least one promotion was shown
+    to the user on the last 7 days and if at least one SMS was sent. If multiple
+    SMSs were sent (at any time), it uses the time from the most recently sent
+    one. If the  is negative due to bad clock on one of the clients it will be
+    logged as 0. CompletionTime will be prefixed by the entry point promotion
+    name that was responsible for the SMS sending.
+  </summary>
+</histogram>
+
 <histogram name="DevTools.ActionTaken" enum="DevToolsAction">
   <owner>sergeyv@chromium.org</owner>
   <owner>vsevik@chromium.org</owner>
@@ -82062,6 +82090,13 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="12" label="Tab capturer created without audio capturer."/>
 </enum>
 
+<enum name="DesktopIOSPromotionEntryPoint" type="int">
+  <int value="1" label="Save Passwords new bubble."/>
+  <int value="2" label="Bookmarks new bubble."/>
+  <int value="3" label="Bookmarks existing bubble."/>
+  <int value="4" label="HistoryPage."/>
+</enum>
+
 <enum name="DesktopSearchRedirectionInfobarCloseAction" type="int">
   <int value="0" label="Clicked the 'Manage search settings' link"/>
   <int value="1" label="Clicked the dismiss button"/>
@@ -110414,6 +110449,22 @@ value.
       name="Prerender.SimulatedLocalBrowsingPLT_PrerenderNoUse"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="DesktopIOSEntryPoints" separator="."
+    ordering="prefix">
+  <suffix name="SavePasswordsNewBubble"/>
+  <suffix name="BookmarksNewBubble"/>
+  <suffix name="BookmarksExistingBubble"/>
+  <suffix name="HistoryPage"/>
+  <affected-histogram name="DesktopIOSPromotion.SMSToSigninTime"/>
+</histogram_suffixes>
+
+<histogram_suffixes name="DesktopIOSPromotionSMSSent" separator="."
+    ordering="prefix">
+  <suffix name="SMSSent" label="SMS sent from the promotion."/>
+  <suffix name="NoSMS" label="No SMS was sent from the promotion."/>
+  <affected-histogram name="DesktopIOSPromotion.IOSSigninReason"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="DiskUsagePerUserCount" separator=".">
   <suffix name="1User" label="Only 1 user exists on device."/>
   <suffix name="2Users" label="2 users exist on device."/>