[MacViews] Frameless app windows: make content view cover title bar.

chrome/browser/ui/views/apps/chrome_native_app_window_views_mac.mm

Index: chrome/browser/ui/views/apps/chrome_native_app_window_views_mac.mm
diff --git a/chrome/browser/ui/views/apps/chrome_native_app_window_views_mac.mm b/chrome/browser/ui/views/apps/chrome_native_app_window_views_mac.mm
index 4920ac74158f2413895398431c6941d2fa0f5a15..a90b38d8053dd1e73bc2eae990da99f4c7ad4262 100644
--- a/chrome/browser/ui/views/apps/chrome_native_app_window_views_mac.mm
+++ b/chrome/browser/ui/views/apps/chrome_native_app_window_views_mac.mm
@@ -5,6 +5,7 @@
 #import "chrome/browser/ui/views/apps/chrome_native_app_window_views_mac.h"
 
 #include "chrome/browser/apps/app_shim/extension_app_shim_handler_mac.h"
+#include "chrome/browser/ui/views/apps/app_window_native_widget_mac.h"
 
 ChromeNativeAppWindowViewsMac::ChromeNativeAppWindowViewsMac()
     : is_hidden_with_app_(false) {
@@ -13,6 +14,16 @@ ChromeNativeAppWindowViewsMac::ChromeNativeAppWindowViewsMac()
 ChromeNativeAppWindowViewsMac::~ChromeNativeAppWindowViewsMac() {
 }
 
+void ChromeNativeAppWindowViewsMac::OnBeforeWidgetInit(
+    const extensions::AppWindow::CreateParams& create_params,
+    views::Widget::InitParams* init_params,
+    views::Widget* widget) {
+  DCHECK(!init_params->native_widget);
+  init_params->native_widget = new AppWindowNativeWidgetMac(widget);
+  ChromeNativeAppWindowViews::OnBeforeWidgetInit(create_params, init_params,
+                                                 widget);
+}
+
 void ChromeNativeAppWindowViewsMac::Show() {
   if (is_hidden_with_app_) {
     // If there is a shim to gently request attention, return here. Otherwise