Add GN build for parts of gpu and ozone.

ui/gfx/BUILD.gn

Index: ui/gfx/BUILD.gn
diff --git a/ui/gfx/BUILD.gn b/ui/gfx/BUILD.gn
index 9a3463d6a3bbffacbd269afa99a1b85fc4937adc..5b2c4eef0f0ba8cd7c9957a026a76b52b652f679 100644
--- a/ui/gfx/BUILD.gn
+++ b/ui/gfx/BUILD.gn
@@ -6,6 +6,9 @@ import("//build/config/ui.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
 }
+if (use_ozone) {
+  import("//ui/ozone/ozone.gni")
+}
 
 # Several targets want to include this header file, and some of them are
 # child dependencies of "gfx". Therefore, we separate it out here so multiple
@@ -334,7 +337,7 @@ component("gfx") {
       "ozone/overlay_candidates_ozone.h",
     ]
   }
-  if (ozone_platform_dri) {
+  if (use_ozone && ozone_platform_dri) {
     configs += [ "//build/config/linux:dridrm" ]

[spang, 2014/05/14 19:03:06]

We've moved the DRI code to ui/ozone. This dep will need to be added in
ui/ozone/BUILD.gn instead.

   } else {
     sources -= [