Add workaround for Mac stencil buffer leak

ui/compositor/test/in_process_context_provider.cc

Index: ui/compositor/test/in_process_context_provider.cc
diff --git a/ui/compositor/test/in_process_context_provider.cc b/ui/compositor/test/in_process_context_provider.cc
index c442ce06882efd4b2b87052d544b2d590a9fbaea..45ce6fc49a589eee86a354b55b8f206d98f3456c 100644
--- a/ui/compositor/test/in_process_context_provider.cc
+++ b/ui/compositor/test/in_process_context_provider.cc
@@ -135,7 +135,8 @@ class GrContext* InProcessContextProvider::GrContext() {
   if (gr_context_)
     return gr_context_->get();
 
-  gr_context_.reset(new skia_bindings::GrContextForGLES2Interface(ContextGL()));
+  gr_context_.reset(new skia_bindings::GrContextForGLES2Interface(
+      ContextGL(), ContextCapabilities()));
   cache_controller_->SetGrContext(gr_context_->get());
 
   return gr_context_->get();