Implementation of newly designed sign in related histograms for Android

chrome/android/java/src/org/chromium/chrome/browser/ntp/RecentTabsPromoView.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/RecentTabsPromoView.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/RecentTabsPromoView.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/RecentTabsPromoView.java
index b1370ffc78adb7cbf8e1945ed1cc1d9b47adef06..35de30efddaf552532fdebc36dae49341fff60db 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/RecentTabsPromoView.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/RecentTabsPromoView.java
@@ -73,6 +73,11 @@ public class RecentTabsPromoView extends FrameLayout implements AndroidSyncSetti
          * @return A ProfileDataCache to retrieve user account info.
          */
         public ProfileDataCache getProfileDataCache();
+
+        /**
+        * @return the access point of creating this view.
+        */
+        public int getAccessPoint();
     }
 
     /**
@@ -281,7 +286,7 @@ public class RecentTabsPromoView extends FrameLayout implements AndroidSyncSetti
                 assert false : "No forced accounts in SignInPromoView";
             }
         });
-
+        SigninManager.logSigninStartAccessPoint(mModel.getAccessPoint());
         return signInPromoView;
     }
 }