cc: Implement shared worker contexts. (v1)

cc/test/test_context_provider.cc

Index: cc/test/test_context_provider.cc
diff --git a/cc/test/test_context_provider.cc b/cc/test/test_context_provider.cc
index ca7714d30cf9f4ca1b0eaaaeb7c117f7ddd180de..cbc92a55433fe3b197cfbcf196ecaa9e71b6c0dc 100644
--- a/cc/test/test_context_provider.cc
+++ b/cc/test/test_context_provider.cc
@@ -19,7 +19,18 @@ namespace cc {
 
 // static
 scoped_refptr<TestContextProvider> TestContextProvider::Create() {
-  return Create(TestWebGraphicsContext3D::Create().Pass());
+  return Create(TestWebGraphicsContext3D::Create());
+}
+
+// static
+scoped_refptr<TestContextProvider> TestContextProvider::CreateWorker() {
+  scoped_refptr<TestContextProvider> worker_context_provider =
+      Create(TestWebGraphicsContext3D::Create());
+  if (!worker_context_provider)
+    return nullptr;
+  // Worker context is initially bound but not attached to a specific thread.
+  worker_context_provider->bound_ = true;
+  return worker_context_provider;
 }
 
 // static