Updates Zoom bubble layout and adds +/- buttons

chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm

 // Copyright 2012 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/location_bar/location_bar_view_mac.h"
 
 #include "base/bind.h"
 #import "base/mac/mac_util.h"
 #include "base/memory/ptr_util.h"
 #include "base/stl_util.h"
@@ skipping 203 matching lines @@
                                           enabled);
   save_credit_card_decoration_->SetIcon(IsLocationBarDark());
   save_credit_card_decoration_->SetVisible(enabled);
   OnDecorationsChanged();
 }
 
 void LocationBarViewMac::UpdateBookmarkStarVisibility() {
   star_decoration_->SetVisible(IsStarEnabled());
 }
 
+void LocationBarViewMac::UpdateZoomViewVisibility() {
+  UpdateZoomDecoration(/*default_zoom_changed=*/false);
+  OnChanged();
+}
+
 void LocationBarViewMac::UpdateLocationBarVisibility(bool visible,
                                                      bool animate) {
   // Track the target location bar visibility to avoid redundant transitions
   // being initiated when one is already in progress.
   if (visible != location_bar_visible_) {
     [[[BrowserWindowController browserWindowControllerForView:field_]
         toolbarController] updateVisibility:visible
                               withAnimation:animate];
     location_bar_visible_ = visible;
   }
@@ skipping 571 matching lines @@
     OnDecorationsChanged();
 }
 
 std::vector<NSView*> LocationBarViewMac::GetDecorationAccessibilityViews() {
   std::vector<LocationBarDecoration*> decorations = GetDecorations();
   std::vector<NSView*> views;
   for (auto* decoration : decorations)
     views.push_back(decoration->GetAccessibilityView());
   return views;
 }