Add a path to use CALayers to display content

chrome/browser/ui/cocoa/browser_window_controller.mm

Index: chrome/browser/ui/cocoa/browser_window_controller.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller.mm b/chrome/browser/ui/cocoa/browser_window_controller.mm
index 757dc5f941b6b9a1676f2f6b1138da79519693d5..d17d31ca77460358f16200d420a75804e28058c0 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller.mm
@@ -73,6 +73,7 @@
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view.h"
+#include "content/public/common/content_switches.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "grit/locale_settings.h"
@@ -266,6 +267,10 @@ enum {
     NSWindow* window = [self window];
     windowShim_.reset(new BrowserWindowCocoa(browser, self));
 
+    if (CommandLine::ForCurrentProcess()->HasSwitch(
+            switches::kUseCoreAnimation))
+      [[[self window] contentView] setWantsLayer:YES];
+
     // Set different minimum sizes on tabbed windows vs non-tabbed, e.g. popups.
     // This has to happen before -enforceMinWindowSize: is called further down.
     NSSize minSize = [self isTabbedWindow] ?