gpu: Convert egl_native target to GN build.

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 37 matching lines @@
     "//components:components_unittests",
     "//content/shell:content_shell",
     "//content/test:content_browsertests",
     "//content/test:content_perftests",
     "//content/test:content_unittests",
     "//crypto:crypto_unittests",
     "//extensions:extensions_browsertests",
     "//extensions:extensions_unittests",
     "//google_apis/gcm:gcm_unit_tests",
     "//gpu:gpu_unittests",
+    "//gpu/gles2_conform_support/egl",

[tfarina, 2015/03/07 18:13:47]

I just added this line here to test it. I will remove it in patch set 2.

     "//ipc:ipc_tests",
     "//ipc/mojo:ipc_mojo_unittests",
     "//jingle:jingle_unittests",
     "//media:media_unittests",
     "//media/cast:cast_unittests",
     "//mojo",
     "//mojo/common:mojo_common_unittests",
     "//net:net_unittests",
     "//ppapi:ppapi_unittests",
     "//ppapi/examples",  # TODO(GYP): What's the GYP equivalent?
@@ skipping 262 matching lines @@
       "//ui/touch_selection:ui_touch_selection_unittests",  # PASSES 2/25/2015
       "//ui/views:views_unittests",  # PASSES (*) 2/25/2015
       "//ui/wm:wm_unittests",  # PASSES 2/25/2015
       "//url:url_unittests",  # PASSES 2/25/2015
 
       # Note:
       # (*) Fails but failures match GYP build at time of testing.
     ]
   }
 }