Defer compositor context creation to the thread.

cc/test/test_in_process_context_provider.h

Index: cc/test/test_in_process_context_provider.h
diff --git a/cc/test/test_in_process_context_provider.h b/cc/test/test_in_process_context_provider.h
index 351e41e6242f22a073b5c41e5367d9c25a0ed6ca..b3be8c0948fa98220ba5b5d1501e02b54303f66d 100644
--- a/cc/test/test_in_process_context_provider.h
+++ b/cc/test/test_in_process_context_provider.h
@@ -37,7 +37,16 @@ class TestInProcessContextProvider : public ContextProvider {
   explicit TestInProcessContextProvider(
       TestInProcessContextProvider* shared_context);
 
-  bool BindToCurrentThread() override;
+  class DeferredCreate : public ContextProvider::DeferredCreate {
+   public:
+    explicit DeferredCreate(TestInProcessContextProvider* shared_context)
+        : shared_context_(shared_context) {}
+    scoped_refptr<ContextProvider> CreateContext() override;
+
+   private:
+    TestInProcessContextProvider* shared_context_;
+  };
+
   gpu::gles2::GLES2Interface* ContextGL() override;
   gpu::ContextSupport* ContextSupport() override;
   class GrContext* GrContext() override;