Fix DirectCompositionSurfaceTest.TestMakeCurrent flakiness.

gpu/ipc/service/direct_composition_surface_win.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/ipc/service/direct_composition_surface_win.h"
 
 #include "base/optional.h"
 #include "gpu/ipc/service/gpu_channel_manager.h"
 #include "gpu/ipc/service/gpu_channel_manager_delegate.h"
 #include "ui/gfx/native_widget_types.h"
@@ skipping 305 matching lines @@
 
   EGLClientBuffer buffer =
       reinterpret_cast<EGLClientBuffer>(draw_texture_.get());
   real_surface_ = eglCreatePbufferFromClientBuffer(
       GetDisplay(), EGL_D3D_TEXTURE_ANGLE, buffer, GetConfig(),
       &pbuffer_attribs[0]);
 
   return true;
 }
 
+scoped_refptr<base::TaskRunner>
+DirectCompositionSurfaceWin::GetWindowTaskRunnerForTesting() {
+  return child_window_.GetTaskRunnerForTesting();
+}
+
 DirectCompositionSurfaceWin::Overlay::Overlay(int z_order,
                                               gfx::OverlayTransform transform,
                                               scoped_refptr<gl::GLImage> image,
                                               gfx::Rect bounds_rect,
                                               gfx::RectF crop_rect)
     : z_order(z_order),
       transform(transform),
       image(image),
       bounds_rect(bounds_rect),
       crop_rect(crop_rect) {}
 
 DirectCompositionSurfaceWin::Overlay::Overlay(const Overlay& overlay) = default;
 
 DirectCompositionSurfaceWin::Overlay::~Overlay() {}
 
 }  // namespace gpu