Disable BasicSharedContexts tests on opengl::wgl

Summary:
In D49297661, I added unit tests for shared contexts. The diff passed all tests when landing, but Windows unit tests are not land blocking and have been failing since when ran manually.

IGL's WGL implementation isn't complete. It's has no support for shared contexts and no logic for handling sharegroups. Instead of implementing all of that, I'm simply skipping that specific unit test, at least until someone actually needs it.

Reviewed By: EricGriffith

Differential Revision: D50542255

fbshipit-source-id: c39473ece1780932b95a24e185a6ca424a09360e

src/igl/tests/ogl/Context.cpp

@@ -8,6 +8,7 @@
 #include "../util/TestDevice.h"
 
 #include <gtest/gtest.h>
+#include <igl/Macros.h>
 #include <igl/opengl/Device.h>
 #include <igl/opengl/GLIncludes.h>
 #include <igl/opengl/IContext.h>
@@ -313,6 +314,9 @@ TEST_F(ContextOGLTest, CheckForErrorsInvalidFrameBufferOperation) {
 
 /// Verify that an object is visible across contexts in the same sharegroup
 TEST_F(ContextOGLTest, BasicSharedContexts) {
+#if IGL_PLATFORM_WIN && !IGL_ANGLE
+  GTEST_SKIP() << "Context sharing not implemented in opengl::wgl";
+#endif
   // Setup is three contexts, (1) and (2) part of the same sharegroup and (3) not.
   igl::Result result;
   auto sharedContext = context_->createShareContext(&result);