Add initial implementation of cc::Surfaces backend for exo.

components/exo/display.cc

Index: components/exo/display.cc
diff --git a/components/exo/display.cc b/components/exo/display.cc
index 03df31fcab85ee52af42a6bec6ab26ffc68298e9..356066fe8b4d0a87b95c04bab1aeea936b01a222 100644
--- a/components/exo/display.cc
+++ b/components/exo/display.cc
@@ -7,6 +7,7 @@
 #include <iterator>
 #include <utility>
 
+#include "base/command_line.h"
 #include "base/memory/ptr_util.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
@@ -27,10 +28,15 @@
 
 namespace exo {
 
+const char kUseExoSurfaceLayer[] = "use-exo-surface-layer";
+
 ////////////////////////////////////////////////////////////////////////////////
 // Display, public:
 
-Display::Display() {}
+Display::Display() {
+  Surface::SetUseSurfaceLayer(
+      base::CommandLine::ForCurrentProcess()->HasSwitch(kUseExoSurfaceLayer));
+}
 
 Display::~Display() {}