Add unittests for gl_surface_egl to cover the changes in crrev.com/2698573002.

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/buildflag_header.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//build/config/ui.gni")
 import("//ui/ozone/ozone.gni")
 import("//testing/test.gni")
@@ skipping 362 matching lines @@
 test("gl_unittests") {
   sources = [
     "gl_api_unittest.cc",
     "gl_image_ref_counted_memory_unittest.cc",
     "gl_image_shared_memory_unittest.cc",
     "gl_surface_format_unittest.cc",
     "gl_version_info_unittest.cc",
     "gpu_timing_unittest.cc",
   ]
 
+  if (use_egl && !use_ozone) {
+    sources += [ "gl_surface_egl_unittest.cc" ]
+  }
+
   if (use_egl) {
     sources += [
       "egl_api_unittest.cc",
       "test/egl_initialization_displays_unittest.cc",
     ]
   }
 
   if (use_glx) {
     sources += [ "glx_api_unittest.cc" ]
   }
@@ skipping 54 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"
   }
 }