Add a path to use CALayers to display content

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 664b87f8e69fac91f21f4fcf22a07d285ff5410e..04b7541aba81108760323f1de43e5d09abede45a 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -785,6 +785,9 @@ const char kChildCleanExit[]                = "child-clean-exit";
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
 const char kDisableCarbonInterposing[]      = "disable-carbon-interposing";
+
+// Use core animation to draw content.
+const char kUseCoreAnimation[]              = "use-core-animation";
 #endif
 
 // Disables the use of a 3D software rasterizer.