Add a path to use CALayers to display content

chrome/browser/ui/cocoa/browser_window_controller.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/browser_window_controller.h"
 
 #include <cmath>
 #include <numeric>
 
 #include "base/command_line.h"
@@ skipping 55 matching lines @@
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_delegate.h"
 #include "chrome/browser/ui/toolbar/encoding_menu_controller.h"
 #include "chrome/browser/ui/window_sizer/window_sizer.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/url_constants.h"
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/content_switches.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "grit/locale_settings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 #include "ui/gfx/mac/scoped_ns_disable_screen_updates.h"
 
 using l10n_util::GetStringUTF16;
 using l10n_util::GetNSStringWithFixup;
 using l10n_util::GetNSStringFWithFixup;
@@ skipping 172 matching lines @@
 - (id)initWithBrowser:(Browser*)browser takeOwnership:(BOOL)ownIt {
   bool hasTabStrip = browser->SupportsWindowFeature(Browser::FEATURE_TABSTRIP);
   if ((self = [super initTabWindowControllerWithTabStrip:hasTabStrip])) {
     DCHECK(browser);
     initializing_ = YES;
     browser_.reset(browser);
     ownsBrowser_ = ownIt;
     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] ?
       NSMakeSize(400, 272) : NSMakeSize(100, 122);
     [[self window] setMinSize:minSize];
 
     // Create the bar visibility lock set; 10 is arbitrary, but should hopefully
     // be big enough to hold all locks that'll ever be needed.
     barVisibilityLocks_.reset([[NSMutableSet setWithCapacity:10] retain]);
 
@@ skipping 1950 matching lines @@
 
 - (BOOL)supportsBookmarkBar {
   return [self supportsWindowFeature:Browser::FEATURE_BOOKMARKBAR];
 }
 
 - (BOOL)isTabbedWindow {
   return browser_->is_type_tabbed();
 }
 
 @end  // @implementation BrowserWindowController(WindowType)