Add GetProcAddress to OpenGL control interface

mojo/gles2/BUILD.gn

Index: mojo/gles2/BUILD.gn
diff --git a/mojo/gles2/BUILD.gn b/mojo/gles2/BUILD.gn
index ee32ab12fd9783d168c0c8aa315284390ca755e2..bb67923ae3c95ff134ac3c6a1a29c374c18429ff 100644
--- a/mojo/gles2/BUILD.gn
+++ b/mojo/gles2/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//testing/test.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 config("mojo_use_gles2") {
@@ -79,3 +80,22 @@ source_set("mgl") {
     "//mojo/public/cpp/system",
   ]
 }
+
+test("mgl_unittests") {
+  deps = [
+    ":mgl",
+    "//base",
+    "//base/test:test_support",
+    "//mojo/edk/system",
+    "//mojo/edk/test:run_all_unittests",
+    "//mojo/edk/test:test_support_impl",
+    "//mojo/public/c/gpu:MGL",
+    "//mojo/public/c/test_support:test_support",
+    "//mojo/public/cpp/environment:standalone",
+    "//testing/gtest:gtest",
+  ]
+
+  sources = [
+    "mgl_unittest.cc",
+  ]
+}