Defer compositor context creation to the thread.

cc/test/test_in_process_context_provider.cc

Index: cc/test/test_in_process_context_provider.cc
diff --git a/cc/test/test_in_process_context_provider.cc b/cc/test/test_in_process_context_provider.cc
index c66e6ca09c4e5466493fe0149d10c906571ca1d0..40eb98ad272e7fe9fc207efe9bd395ea1bcd2b2c 100644
--- a/cc/test/test_in_process_context_provider.cc
+++ b/cc/test/test_in_process_context_provider.cc
@@ -58,6 +58,11 @@ std::unique_ptr<gpu::GLInProcessContext> CreateTestInProcessContext() {
   return CreateTestInProcessContext(nullptr, nullptr, nullptr);
 }
 
+scoped_refptr<ContextProvider>
+TestInProcessContextProvider::Factory::CreateContext() {
+  return new TestInProcessContextProvider(shared_context_);
+}
+
 TestInProcessContextProvider::TestInProcessContextProvider(
     TestInProcessContextProvider* shared_context)
     : context_(CreateTestInProcessContext(
@@ -68,10 +73,6 @@ TestInProcessContextProvider::TestInProcessContextProvider(
 TestInProcessContextProvider::~TestInProcessContextProvider() {
 }
 
-bool TestInProcessContextProvider::BindToCurrentThread() {
-  return true;
-}
-
 gpu::gles2::GLES2Interface* TestInProcessContextProvider::ContextGL() {
   return context_->GetImplementation();
 }