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 5c78cdb3eda52b689541eec68fdeb4dfb917dee6..18c7336280f51117d8294d1fa4c8c76e152cf225 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -49841,7 +49841,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <owner>jialiul@chromium.org</owner>
   <owner>nparker@chromium.org</owner>
   <summary>
-    Verdict types returned by Safe Browsing server for password reuse events.
+    Deprecated. Replaced by
+    &quot;PasswordProtection.Verdict.ProtectedPasswordEntry&quot;. Verdict types
+    returned by Safe Browsing server for password reuse events.
   </summary>
 </histogram>
 
@@ -49870,7 +49872,19 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <owner>jialiul@chromium.org</owner>
   <owner>nparker@chromium.org</owner>
   <summary>
-    Verdict types returned by Safe Browsing server for unfamiliar login pages.
+    Deprecated. Replaced by
+    &quot;PasswordProtection.Verdict.PasswordFieldOnFocus&quot;. Verdict types
+    returned by Safe Browsing server for unfamiliar login pages.
+  </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>
 
@@ -89671,6 +89685,13 @@ 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"/>
+  <suffix name="ProtectedPasswordEntry"/>
+  <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."/>