(not for commit) Create 2nd ContextProvider for Ganesh rasterization.

ui/compositor/test/in_process_context_factory.cc

Index: ui/compositor/test/in_process_context_factory.cc
diff --git a/ui/compositor/test/in_process_context_factory.cc b/ui/compositor/test/in_process_context_factory.cc
index 16ccfd837f4df6ef5de91fdb1ab3411ffe1b2f1a..19d770970f1a03ed978a39f26f4072dcfc0440f5 100644
--- a/ui/compositor/test/in_process_context_factory.cc
+++ b/ui/compositor/test/in_process_context_factory.cc
@@ -108,7 +108,7 @@ void InProcessContextFactory::CreateOutputSurface(
   if (use_test_surface_) {
     bool flipped_output_surface = false;
     compositor->SetOutputSurface(make_scoped_ptr(new cc::PixelTestOutputSurface(
-        context_provider, flipped_output_surface)));
+        context_provider, nullptr, flipped_output_surface)));
   } else {
     compositor->SetOutputSurface(
         make_scoped_ptr(new DirectOutputSurface(context_provider)));