Add OzoneGLImpl interface.

ui/gl/BUILD.gn

 # Copyright 2014 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/linux/pkg_config.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 use_egl = is_win || is_android || is_linux
 use_glx = use_x11
@@ skipping 293 matching lines @@
     "//ui/gl/init",
   ]
   deps = [
     "//testing/gtest",
   ]
 
   if (use_x11) {
     configs += [ "//build/config/linux:x11" ]
     deps += [ "//ui/platform_window/x11" ]
   }
+
+  if (use_ozone) {
+    deps += [ "//ui/ozone" ]

[rjkroege, 2016/08/26 19:55:53]

Would it be too hard to narrow the dependency?. Can we only depend on
ui/ozone/public here?

[kylechar, 2016/08/29 15:38:14]

Well, the DEPS only allows ui/ozone/public for #include statements. There is no
//ui/ozone/public target but the //ui/ozone target only exposes headers in
//ui/ozone/public so it's essentially equivalent? 

This is also only to perform the GPU initialization for tests and might not be
necessary if that was done differently.

+  }
 }
 
 source_set("run_all_unittests") {
   testonly = true
 
   sources = [
     "test/run_all_unittests.cc",
   ]
 
   deps = [
@@ skipping 68 matching lines @@
     sources = [
       "../android/java/src/org/chromium/ui/gl/SurfaceTextureListener.java",
       "../android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java",
     ]
     public_deps = [
       ":surface_jni_headers",
     ]
     jni_package = "ui/gl"
   }
 }