Add EGL tests to help troubleshoot environment problems

src/tests/angle_end2end_tests.gypi

@@ -68,6 +68,7 @@
             '<(angle_path)/src/tests/gl_tests/ViewportTest.cpp',
             '<(angle_path)/src/tests/egl_tests/EGLContextCompatibilityTest.cpp',
             '<(angle_path)/src/tests/egl_tests/EGLQueryContextTest.cpp',
+            '<(angle_path)/src/tests/egl_tests/EGLSanityCheckTest.cpp',
             '<(angle_path)/src/tests/egl_tests/EGLSurfaceTest.cpp',
             '<(angle_path)/src/tests/test_utils/ANGLETest.cpp',
             '<(angle_path)/src/tests/test_utils/ANGLETest.h',

src/tests/egl_tests/EGLSanityCheckTest.cpp

+//
+// Copyright 2015 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// EGLSanityCheckTest.cpp:
+//      tests used to check setup in which tests are run.
+
+#include <gtest/gtest.h>
+
+#include "test_utils/ANGLETest.h"
+
+// Checks the tests are running against ANGLE
+TEST(EGLSanityCheckTest, IsRunningOnANGLE)
+{
+    const char *extensionString =
+        static_cast<const char *>(eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS));
+    ASSERT_NE(strstr(extensionString, "EGL_ANGLE_platform_angle"), nullptr);
+}
+
+// Checks that getting function pointer works
+TEST(EGLSanityCheckTest, HasGetPlatformDisplayEXT)
+{
+    PFNEGLGETPLATFORMDISPLAYEXTPROC eglGetPlatformDisplayEXT =
+        reinterpret_cast<PFNEGLGETPLATFORMDISPLAYEXTPROC>(
+            eglGetProcAddress("eglGetPlatformDisplayEXT"));
+
+    ASSERT_NE(eglGetPlatformDisplayEXT, nullptr);
+}