Add histograms to be used by easy unlock 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 ba4ab78b7e10e415cf4c4d1c91cf39d509f0d306..1c5c46f8707702d1e244b3dffc4200f76a2fe624 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -4885,6 +4885,36 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="EasyUnlock.ClickedButton" enum="EasyUnlockButton">
+  <owner>joshwoodward@google.com</owner>
+  <owner>tbarzic@chromium.org</owner>
+  <summary>Button clicked in EasyUnlock app during setup process.</summary>
+</histogram>
+
+<histogram name="EasyUnlock.NotificationEvent"
+    enum="EasyUnlockNotificationEvent">
+  <owner>joshwoodward@google.com</owner>
+  <owner>tbarzic@chromium.org</owner>
+  <summary>
+    Tracks events related to notifications used by EasyUnlock feature. For
+    example a specific EasyUnlock notification being shown or clicked.
+  </summary>
+</histogram>
+
+<histogram name="EasyUnlock.SetupStateOnClose" enum="EasyUnlockSetupState">
+  <owner>joshwoodward@google.com</owner>
+  <owner>tbarzic@chromium.org</owner>
+  <summary>
+    The state of EasyUnlock setup when the app window was closed by user.
+  </summary>
+</histogram>
+
+<histogram name="EasyUnlock.UnlockEvent" enum="EasyUnlockUnlockEvent">
+  <owner>joshwoodward@google.com</owner>
+  <owner>tbarzic@chromium.org</owner>
+  <summary>Screen unlock events detected while EasyUnlock was enabled.</summary>
+</histogram>
+
 <histogram name="Enterprise.AutoEnrollmentExtraTime" units="milliseconds">
   <owner>joaodasilva@chromium.org</owner>
   <summary>
@@ -33115,6 +33145,38 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="4" label="TTLS"/>
 </enum>
 
+<enum name="EasyUnlockButton" type="int">
+  <int value="0" label="Setup app launches"/>
+  <int value="1" label="Find device"/>
+  <int value="2" label="Pair device"/>
+  <int value="3" label="Try out"/>
+  <int value="4" label="Enable"/>
+  <int value="5" label="Disable"/>
+</enum>
+
+<enum name="EasyUnlockNotificationEvent" type="int">
+  <int value="0" label="Set up notification shown"/>
+  <int value="1" label="Set up notification clicked"/>
+  <int value="2" label="Try out notification shown"/>
+  <int value="3" label="Try out notification clicked"/>
+</enum>
+
+<enum name="EasyUnlockSetupState" type="int">
+  <int value="0" label="Success"/>
+  <int value="1" label="Scan (initial)"/>
+  <int value="2" label="Scan (in progress)"/>
+  <int value="3" label="Scan (error)"/>
+  <int value="4" label="Pairing (initial)"/>
+  <int value="5" label="Pairing (in progress)"/>
+  <int value="6" label="Pairing (error)"/>
+  <int value="7" label="Help"/>
+</enum>
+
+<enum name="EasyUnlockUnlockEvent" type="int">
+  <int value="0" label="Screen unlocked (total)"/>
+  <int value="1" label="Screen unlocked (via EasyUnlock)"/>
+</enum>
+
 <enum name="EnterpriseCheckError" type="int">
   <int value="0" label="Cound not get net join info."/>
   <int value="1" label="Cound not bind to domain controller."/>