MacViews: Harmony for TabDialogs' dialogs (starting with Collected Cookies)

chrome/browser/ui/cocoa/tab_dialogs_cocoa.mm

Index: chrome/browser/ui/cocoa/tab_dialogs_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/tab_dialogs_cocoa.mm b/chrome/browser/ui/cocoa/tab_dialogs_cocoa.mm
index e70c579cb16db23e020df1c2c30ab719f2f51978..bc20ecf6ea6868439825f9ddee13da149bf735da 100644
--- a/chrome/browser/ui/cocoa/tab_dialogs_cocoa.mm
+++ b/chrome/browser/ui/cocoa/tab_dialogs_cocoa.mm
@@ -9,14 +9,22 @@
 #import "chrome/browser/ui/cocoa/hung_renderer_controller.h"
 #import "chrome/browser/ui/cocoa/passwords/passwords_bubble_cocoa.h"
 #import "chrome/browser/ui/cocoa/profiles/profile_signin_confirmation_dialog_cocoa.h"
+#include "chrome/browser/ui/cocoa/tab_dialogs_views_mac.h"
 #import "chrome/browser/ui/cocoa/validation_message_bubble_cocoa.h"
 #include "content/public/browser/web_contents.h"
+#include "ui/base/material_design/material_design_controller.h"
 
 // static
 void TabDialogs::CreateForWebContents(content::WebContents* contents) {
   DCHECK(contents);
-  if (!FromWebContents(contents))
-    contents->SetUserData(UserDataKey(), new TabDialogsCocoa(contents));
+
+  if (!FromWebContents(contents)) {
+    TabDialogs* tab_dialogs =
+        ui::MaterialDesignController::IsSecondaryUiMaterial()
+            ? new TabDialogsViewsMac(contents)
+            : new TabDialogsCocoa(contents);
+    contents->SetUserData(UserDataKey(), tab_dialogs);
+  }
 }
 
 TabDialogsCocoa::TabDialogsCocoa(content::WebContents* contents)