Do additional blit and Present on first draw to overlay.

gpu/ipc/service/direct_composition_surface_win.cc

Index: gpu/ipc/service/direct_composition_surface_win.cc
diff --git a/gpu/ipc/service/direct_composition_surface_win.cc b/gpu/ipc/service/direct_composition_surface_win.cc
index ac184e96e62625f2d9ebf3fb886cc2998e6d0867..e047d7650f34c0dbd82c9dcff32d7f242e8b0968 100644
--- a/gpu/ipc/service/direct_composition_surface_win.cc
+++ b/gpu/ipc/service/direct_composition_surface_win.cc
@@ -413,7 +413,25 @@ void DCLayerTree::SwapChainPresenter::PresentToSwapChain(
   swap_chain_scale_x_ = bounds_rect.width() * 1.0f / swap_chain_size.width();
   swap_chain_scale_y_ = bounds_rect.height() * 1.0f / swap_chain_size.height();
 
-  swap_chain_->Present(first_present ? 0 : 1, 0);
+  if (first_present) {
+    swap_chain_->Present(0, 0);
+
+    // DirectComposition can display black for a swapchain between the first
+    // and second time it's presented to - maybe the first Present can get
+    // lost somehow and it shows the wrong buffer.In that case copy the

[sunnyps, 2017/04/13 21:03:13]

nit: space after period

+    // buffers so both have the correct contents, which seems to help. The
+    // first Present() after this needs to have SyncInterval > 0, or else the
+    // workaround doesn't help.
+    base::win::ScopedComPtr<ID3D11Texture2D> dest_texture;
+    swap_chain_->GetBuffer(0, IID_PPV_ARGS(dest_texture.Receive()));

[sunnyps, 2017/04/13 21:03:12]

nit: CHECK if these calls succeeded?

+    base::win::ScopedComPtr<ID3D11Texture2D> src_texture;
+    swap_chain_->GetBuffer(1, IID_PPV_ARGS(src_texture.Receive()));
+    base::win::ScopedComPtr<ID3D11DeviceContext> context;
+    d3d11_device_->GetImmediateContext(context.Receive());
+    context->CopyResource(dest_texture.get(), src_texture.get());
+  }
+
+  swap_chain_->Present(1, 0);
 
   base::win::ScopedComPtr<IDXGISwapChainMedia> swap_chain_media;
   if (SUCCEEDED(swap_chain_.QueryInterface(swap_chain_media.Receive()))) {