Add UMA metrics to phishguard pings

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 68206764ad76095705618b2d6a55f02b4f3164a1..b805eb69ee71c9b9717a6995a4140205e23e0706 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -49926,6 +49926,10 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="PasswordProtection.PasswordReuseEventVerdict"
     enum="PasswordProtectionVerdict">
+  <obsolete>
+    Deprecated since May 12 2017. Replaced by
+    PasswordProtection.Verdict.ProtectedPasswordEntry.
+  </obsolete>
   <owner>jialiul@chromium.org</owner>
   <owner>nparker@chromium.org</owner>
   <summary>
@@ -49942,7 +49946,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="PasswordProtection.RequestOutcome"
+<histogram base="true" name="PasswordProtection.RequestOutcome"
     enum="PasswordProtectionRequestOutcome">
   <owner>jialiul@chromium.org</owner>
   <owner>nparker@chromium.org</owner>
@@ -49955,6 +49959,10 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="PasswordProtection.UnfamiliarLoginPageVerdict"
     enum="PasswordProtectionVerdict">
+  <obsolete>
+    Deprecated since May 12 2017. Replaced by
+    PasswordProtection.Verdict.PasswordFieldOnFocus.
+  </obsolete>
   <owner>jialiul@chromium.org</owner>
   <owner>nparker@chromium.org</owner>
   <summary>
@@ -49962,6 +49970,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="PasswordProtection.Verdict" enum="PasswordProtectionVerdict">
+  <owner>jialiul@chromium.org</owner>
+  <owner>nparker@chromium.org</owner>
+  <summary>
+    Verdict types returned by Safe Browsing server for a password protection
+    request. Request can be triggered when user focuses on a password field or
+    enters a protected password.
+  </summary>
+</histogram>
+
 <histogram
     name="PaymentRequest.CanMakePayment.NotUsed.WithShowEffectOnCompletion"
     enum="PaymentRequestFlowCompletionStatus">
@@ -89834,6 +89852,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <affected-histogram name="PasswordManager.SavePasswordPromptResponse"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="PasswordProtectionTrigger">
+  <suffix name="PasswordFieldOnFocus"
+      label="Password protection triggered by password field on focus event."/>
+  <suffix name="ProtectedPasswordEntry"
+      label="Password protection triggered by password reuse event."/>
+  <affected-histogram name="PasswordProtection.RequestOutcome"/>
+  <affected-histogram name="PasswordProtection.Verdict"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="PasswordReuseSourceRealm" separator=".">
   <suffix name="FromHttpRealm"
       label="The account in question was saved on an HTTP site."/>