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

components/exo/BUILD.gn

 # Copyright 2015 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("//build/config/ui.gni")
 import("//testing/test.gni")
 
 source_set("exo") {
   sources = [
     "buffer.cc",
@@ skipping 18 matching lines @@
     "surface_observer.h",
     "touch.cc",
     "touch.h",
     "touch_delegate.h",
   ]
 
   deps = [
     "//ash",
     "//base",
     "//cc",
+    "//cc/surfaces:surfaces",
     "//gpu",
     "//gpu/command_buffer/client:gles2_interface",
     "//skia",
     "//ui/aura",
     "//ui/compositor",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
     "//ui/views",
     "//ui/wm:wm",
@@ skipping 71 matching lines @@
   deps = [
     ":unit_tests",
     "//ash:test_support",
     "//base",
     "//base/test:test_support",
   ]
   if (is_linux) {
     deps += [ "//components/exo/wayland:unit_tests" ]
   }
 }