Do additional blit and Present on first draw to overlay.

gpu/ipc/service/direct_composition_surface_win_unittest.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/memory/weak_ptr.h"
 #include "base/run_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/win/scoped_gdi_object.h"
@@ skipping 308 matching lines @@
       surface->GetLayerSwapChainForTesting(1);
   ASSERT_FALSE(swap_chain);
 
   EXPECT_EQ(gfx::SwapResult::SWAP_ACK, surface->SwapBuffers());
 
   swap_chain = surface->GetLayerSwapChainForTesting(1);
   ASSERT_TRUE(swap_chain);
 
   UINT last_present_count = 0;
   EXPECT_TRUE(SUCCEEDED(swap_chain->GetLastPresentCount(&last_present_count)));
-  EXPECT_EQ(1u, last_present_count);
+
+  // One present is normal, and a second present because it's the first frame
+  // and the other buffer needs to be drawn to.
+  EXPECT_EQ(2u, last_present_count);
 
   surface->ScheduleDCLayer(params);
   EXPECT_EQ(gfx::SwapResult::SWAP_ACK, surface->SwapBuffers());
 
   base::win::ScopedComPtr<IDXGISwapChain1> swap_chain2 =
       surface->GetLayerSwapChainForTesting(1);
   EXPECT_EQ(swap_chain2, swap_chain);
 
   // It's the same image, so it should have the same swapchain.
   EXPECT_TRUE(SUCCEEDED(swap_chain->GetLastPresentCount(&last_present_count)));
-  EXPECT_EQ(1u, last_present_count);
+  EXPECT_EQ(2u, last_present_count);
 
   // The size of the swapchain changed, so it should be recreated.
   ui::DCRendererLayerParams params2(false, gfx::Rect(), 1, gfx::Transform(),
                                     image_dxgi.get(),
                                     gfx::RectF(gfx::Rect(texture_size)),
                                     gfx::Rect(0, 0, 25, 25), 0, 0, 1.0, 0);
   surface->ScheduleDCLayer(params2);
 
   EXPECT_EQ(gfx::SwapResult::SWAP_ACK, surface->SwapBuffers());
 
@@ skipping 144 matching lines @@
   EXPECT_TRUE(AreColorsSimilar(expected_color, actual_color))
       << std::hex << "Expected " << expected_color << " Actual "
       << actual_color;
 
   context = nullptr;
   DestroySurface(std::move(surface_));
 }
 
 }  // namespace
 }  // namespace gpu