Defer compositor context creation to the thread.

cc/resources/resource_provider_unittest.cc

Index: cc/resources/resource_provider_unittest.cc
diff --git a/cc/resources/resource_provider_unittest.cc b/cc/resources/resource_provider_unittest.cc
index 578eeb066813ad2a5a56888a5aed56f6fecb7544..1788e56f9970f2fe5400e75abd59dbf2cefc1af7 100644
--- a/cc/resources/resource_provider_unittest.cc
+++ b/cc/resources/resource_provider_unittest.cc
@@ -427,10 +427,9 @@ class ResourceProviderTest
             ResourceProviderContext::Create(shared_data_.get()));
         context3d_ = context3d.get();
 
-        scoped_refptr<TestContextProvider> context_provider =
-            TestContextProvider::Create(std::move(context3d));
-
-        output_surface_ = FakeOutputSurface::Create3d(context_provider);
+        output_surface_ = FakeOutputSurface::Create3d(
+            base::MakeUnique<TestContextProvider::Factory>(
+                std::move(context3d)));
 
         std::unique_ptr<ResourceProviderContext> child_context_owned =
             ResourceProviderContext::Create(shared_data_.get());