Suppress flaky OpenGL ES3 test.

src/tests/gl_tests/TextureTest.cpp

@@ -4466,6 +4466,9 @@ TEST_P(Texture2DTestES3, MinificationWithSamplerNoMipmapping)
 // texture is output.
 TEST_P(Texture2DIntegerTestES3, IntegerTextureNonZeroBaseLevel)
 {
+    // Flaky on Windows OpenGL drivers. http://crbug.com/963595
+    ANGLE_SKIP_TEST_IF(IsOpenGL() && IsWindows());
+
     glActiveTexture(GL_TEXTURE0);
     glBindTexture(GL_TEXTURE_2D, mTexture2D);
     int width     = getWindowWidth();