Skip RobustResourceInitTestES3.MaskedStencilClearBuffer on Intel Mac.

BUG=angleproject:2408

Change-Id: I5994b5ade3c533743c9fc52915aa1d5faca3dd8f
Reviewed-on: https://chromium-review.googlesource.com/984292
Reviewed-by: Geoff Lang <[email protected]>

Author: vonture

src/tests/gl_tests/RobustResourceInitTest.cpp

@@ -1282,6 +1282,9 @@ TEST_P(RobustResourceInitTestES3, MaskedStencilClearBuffer)
 {
     ANGLE_SKIP_TEST_IF(!hasGLExtension());
 
+    // http://anglebug.com/2408
+    ANGLE_SKIP_TEST_IF(IsOSX() && IsOpenGL() && IsIntel());
+
     // http://anglebug.com/2407
     ANGLE_SKIP_TEST_IF(IsAndroid());