Mac: Fix flash on resize (issue #1307)

git-svn-id: https://chromiumembedded.googlecode.com/svn/branches/1916@1749 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

cef.gyp

@@ -1134,6 +1134,9 @@
             'libcef/browser/web_contents_view_osr.h',
             # Include sources for printing.
             '<(DEPTH)/chrome/renderer/printing/print_web_view_helper_mac.mm',
+            # Include sources for CoreAnimation support.
+            '<(DEPTH)/chrome/browser/ui/cocoa/nsview_additions.h',
+            '<(DEPTH)/chrome/browser/ui/cocoa/nsview_additions.mm',
           ],
         }],
         [ 'OS=="linux" or OS=="freebsd" or OS=="openbsd"', {

libcef/browser/browser_host_impl_mac.mm

@@ -19,6 +19,7 @@
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
+#import "chrome/browser/ui/cocoa/nsview_additions.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
@@ -383,6 +384,11 @@ bool CefBrowserHostImpl::PlatformCreateWindow() {
     window_info_.parent_view = parentView;
   }
 
+  // Make the content view for the window have a layer. This will make all
+  // sub-views have layers. This is necessary to ensure correct layer
+  // ordering of all child views and their layers.
+  [[[parentView window] contentView] cr_setWantsLayer:YES];
+
   // Add a reference that will be released in the dealloc handler.
   AddRef();