Use IDCompositionSurface to implement DirectCompositionSurfaceWin.

cc/test/fake_output_surface.h

 // Copyright 2012 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.
 
 #ifndef CC_TEST_FAKE_OUTPUT_SURFACE_H_
 #define CC_TEST_FAKE_OUTPUT_SURFACE_H_
 
 #include <stddef.h>
 
 #include "base/callback.h"
@@ skipping 44 matching lines @@
 
   OutputSurfaceFrame* last_sent_frame() { return last_sent_frame_.get(); }
   size_t num_sent_frames() { return num_sent_frames_; }
 
   OutputSurfaceClient* client() { return client_; }
 
   void BindToClient(OutputSurfaceClient* client) override;
   void EnsureBackbuffer() override {}
   void DiscardBackbuffer() override {}
   void BindFramebuffer() override;
+  void SetDrawRectangle(const gfx::Rect& rect) override;
   void Reshape(const gfx::Size& size,
                float device_scale_factor,
                const gfx::ColorSpace& color_space,
                bool has_alpha,
                bool use_stencil) override;
   void SwapBuffers(OutputSurfaceFrame frame) override;
   uint32_t GetFramebufferCopyTextureFormat() override;
   bool HasExternalStencilTest() const override;
   void ApplyExternalStencil() override {}
   bool SurfaceIsSuspendForRecycle() const override;
@@ skipping 19 matching lines @@
   }
 
   gfx::Rect last_swap_rect() const {
     DCHECK(last_swap_rect_valid_);
     return last_swap_rect_;
   }
 
   const gfx::ColorSpace& last_reshape_color_space() {
     return last_reshape_color_space_;
   }
+  const gfx::Rect& last_set_draw_rectangle() {

[danakj, 2017/02/23 23:38:51]

nit: white space after function body

+    return last_set_draw_rectangle_;
+  }
 
  protected:
   explicit FakeOutputSurface(scoped_refptr<ContextProvider> context_provider);
   explicit FakeOutputSurface(
       std::unique_ptr<SoftwareOutputDevice> software_device);
 
   OutputSurfaceClient* client_ = nullptr;
   std::unique_ptr<OutputSurfaceFrame> last_sent_frame_;
   size_t num_sent_frames_ = 0;
   bool has_external_stencil_test_ = false;
   bool suspended_for_recycle_ = false;
   GLint framebuffer_ = 0;
   GLenum framebuffer_format_ = 0;
   OverlayCandidateValidator* overlay_candidate_validator_ = nullptr;
   bool last_swap_rect_valid_ = false;
   gfx::Rect last_swap_rect_;
   gfx::ColorSpace last_reshape_color_space_;
+  gfx::Rect last_set_draw_rectangle_;
 
  private:
   void SwapBuffersAck();
 
   base::WeakPtrFactory<FakeOutputSurface> weak_ptr_factory_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_OUTPUT_SURFACE_H_