Implement newly designed sign-in related histograms for desktop platorms.

chrome/browser/ui/cocoa/profiles/profile_chooser_controller.h

Index: chrome/browser/ui/cocoa/profiles/profile_chooser_controller.h
diff --git a/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.h b/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.h
index 4df0939edeea648b4abe4f33602fc609e6f2afd4..722d12994849568b4339480275df479261795a55 100644
--- a/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.h
+++ b/chrome/browser/ui/cocoa/profiles/profile_chooser_controller.h
@@ -23,6 +23,11 @@ class ProfileOAuth2TokenService;
 namespace content {
 class WebContents;
 }
+
+namespace signin_metrics {
+enum class AccessPoint;
+}
+
 class GaiaWebContentsDelegate;
 
 // This window controller manages the bubble that displays a "menu" of profiles.
@@ -64,13 +69,17 @@ class GaiaWebContentsDelegate;
 
   // The GAIA service type that caused this menu to open.
   signin::GAIAServiceType serviceType_;
+
+  // The current access point of sign in.
+  signin_metrics::AccessPoint accessPoint_;
 }
 
 - (id)initWithBrowser:(Browser*)browser
            anchoredAt:(NSPoint)point
              viewMode:(profiles::BubbleViewMode)viewMode
          tutorialMode:(profiles::TutorialMode)tutorialMode
-          serviceType:(signin::GAIAServiceType)GAIAServiceType;
+          serviceType:(signin::GAIAServiceType)GAIAServiceType
+          accessPoint:(signin_metrics::AccessPoint)accessPoint;
 
 // Creates all the subviews of the avatar bubble for |viewToDisplay|.
 - (void)initMenuContentsWithView:(profiles::BubbleViewMode)viewToDisplay;