Disable remaining tests that fail on the Linux desktop CrOS GN builds.

ui/gl/gl_image_ozone_native_pixmap_drm_unittest.cc

 // Copyright 2016 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.
 
 #include <fcntl.h>
 #include <libdrm/i915_drm.h>
 #include <linux/types.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <sys/mman.h>
@@ skipping 111 matching lines @@
     return image;
   }
 
   unsigned GetTextureTarget() const { return GL_TEXTURE_EXTERNAL_OES; }
 
   const uint8_t* GetImageColor() { return kImageColor; }
 
  private:
 };
 
-INSTANTIATE_TYPED_TEST_CASE_P(GLImageOzoneNativePixmapDrm,
+
+// TODO(crbug.com/618516) - The tests in this file can only be run
+// on a real device, and not on linux desktop builds, so they are
+// disabled until they can correctly detect the environment and do
+INSTANTIATE_TYPED_TEST_CASE_P(DISABLED_GLImageOzoneNativePixmapDrm,
                               GLImageTest,
                               GLImageOzoneNativePixmapDrmTestDelegate);
 
-INSTANTIATE_TYPED_TEST_CASE_P(GLImageOzoneNativePixmapDrm,
+INSTANTIATE_TYPED_TEST_CASE_P(DISABLED_GLImageOzoneNativePixmapDrm,
                               GLImageBindTest,
                               GLImageOzoneNativePixmapDrmTestDelegate);
 
 }  // namespace
 }  // namespace gl