[Signin] Add Signin_Impression_FromPasswordBubble user action for Desktops

chrome/browser/ui/cocoa/passwords/signin_promo_view_controller.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/passwords/signin_promo_view_controller.h"
 
 #include "base/mac/scoped_nsobject.h"
 #include "chrome/browser/ui/chrome_style.h"
 #import "chrome/browser/ui/cocoa/hover_close_button.h"
 #include "chrome/browser/ui/cocoa/passwords/passwords_bubble_utils.h"
 #include "chrome/browser/ui/passwords/manage_passwords_bubble_model.h"
+#include "content/public/browser/user_metrics.h"
 #include "grit/generated_resources.h"
 #import "ui/base/cocoa/controls/hyperlink_text_view.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
 @interface SignInPromoViewController () {
   base::scoped_nsobject<NSButton> _signInButton;
   base::scoped_nsobject<NSButton> _noButton;
   base::scoped_nsobject<NSButton> _closeButton;
 }
 
@@ skipping 70 matching lines @@
   [titleView setFrameOrigin:NSMakePoint(kFramePadding, curY)];
   const CGFloat height = NSMaxY([titleView frame]) + kFramePadding;
   // The close button is in the corner.
   NSPoint closeButtonOrigin = NSMakePoint(
       NSMaxX([titleView frame]) + chrome_style::kCloseButtonPadding,
       height - NSHeight([_closeButton frame]) -
           chrome_style::kCloseButtonPadding);
   [_closeButton setFrameOrigin:closeButtonOrigin];
   [view setFrame:NSMakeRect(0, 0, kDesiredBubbleWidth, height)];
   [self setView:view];
+  content::RecordAction(
+      base::UserMetricsAction("Signin_Impression_FromPasswordBubble"));
 }
 
 - (void)onSignInClicked:(id)sender {
   ManagePasswordsBubbleModel* model = [self.delegate model];
   if (model)
     model->OnSignInToChromeClicked();
   [self.delegate viewShouldDismiss];
 }
 
 - (void)onNoClicked:(id)sender {
@@ skipping 17 matching lines @@
 
 - (NSButton*)noButton {
   return _noButton.get();
 }
 
 - (NSButton*)closeButton {
   return _closeButton.get();
 }
 
 @end