[Smart Lock] Measure clicks on the lock icon during Easy Unlock's trial run.

chrome/browser/signin/screenlock_bridge.h

Index: chrome/browser/signin/screenlock_bridge.h
diff --git a/chrome/browser/signin/screenlock_bridge.h b/chrome/browser/signin/screenlock_bridge.h
index 4fc8f7deeaea0a448761f2a6d0e313bbbdc83e6a..50d2435ccb90e66481edbff6da1254d94e118774 100644
--- a/chrome/browser/signin/screenlock_bridge.h
+++ b/chrome/browser/signin/screenlock_bridge.h
@@ -67,6 +67,10 @@ class ScreenlockBridge {
     // go to state where password is required for unlock.
     void SetHardlockOnClick();
 
+    // If the current lock screen is a trial run to introduce users to Easy
+    // Unlock, the icon will record metrics upon click.
+    void SetTrialRun();
+
    private:
     UserPodCustomIcon icon_;
 
@@ -77,6 +81,8 @@ class ScreenlockBridge {
 
     bool hardlock_on_click_;
 
+    bool is_trial_run_;
+
     DISALLOW_COPY_AND_ASSIGN(UserPodCustomIconOptions);
   };