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..3e13b46e3cf45472c3f70581a19ff631dc948afe 100644
--- a/cc/test/test_in_process_context_provider.h
+++ b/cc/test/test_in_process_context_provider.h
@@ -9,6 +9,7 @@
 
 #include <memory>
 
+#include "base/macros.h"
 #include "base/synchronization/lock.h"
 #include "cc/output/context_provider.h"
 #include "cc/test/test_gpu_memory_buffer_manager.h"
@@ -37,7 +38,18 @@ class TestInProcessContextProvider : public ContextProvider {
   explicit TestInProcessContextProvider(
       TestInProcessContextProvider* shared_context);
 
-  bool BindToCurrentThread() override;
+  class Factory : public ContextProvider::Factory {
+   public:
+    explicit Factory(TestInProcessContextProvider* shared_context)
+        : shared_context_(shared_context) {}
+    scoped_refptr<ContextProvider> CreateContext() override;
+
+   private:
+    TestInProcessContextProvider* const shared_context_;
+
+    DISALLOW_COPY_AND_ASSIGN(Factory);
+  };
+
   gpu::gles2::GLES2Interface* ContextGL() override;
   gpu::ContextSupport* ContextSupport() override;
   class GrContext* GrContext() override;