Always use DirectCompositionSurfaceWin when using DirectComposition

gpu/ipc/service/image_transport_surface_win.cc

Index: gpu/ipc/service/image_transport_surface_win.cc
diff --git a/gpu/ipc/service/image_transport_surface_win.cc b/gpu/ipc/service/image_transport_surface_win.cc
index d4b5f75e6cb3c3e8ef1c0b2d19c7e559f89794a6..a0885fb0de4984ce4b3f7deb88a5f8d206ee15f2 100644
--- a/gpu/ipc/service/image_transport_surface_win.cc
+++ b/gpu/ipc/service/image_transport_surface_win.cc
@@ -8,7 +8,6 @@
 
 #include "base/metrics/histogram_macros.h"

[sunnyps, 2017/07/24 22:03:47]

nit: don't need the histogram include any more

 #include "base/win/windows_version.h"
-#include "gpu/ipc/service/child_window_surface_win.h"
 #include "gpu/ipc/service/direct_composition_surface_win.h"
 #include "gpu/ipc/service/gpu_vsync_provider_win.h"
 #include "gpu/ipc/service/pass_through_image_transport_surface.h"
@@ -52,25 +51,12 @@ scoped_refptr<gl::GLSurface> ImageTransportSurface::CreateNativeSurface(
       vsync_provider.reset(new gl::VSyncProviderWin(surface_handle));
 
     if (gl::GLSurfaceEGL::IsDirectCompositionSupported()) {
-      bool overlays_supported =
-          DirectCompositionSurfaceWin::AreOverlaysSupported();
-      UMA_HISTOGRAM_BOOLEAN("GPU.DirectComposition.OverlaysSupported",
-                            overlays_supported);
-      if (overlays_supported) {
-        scoped_refptr<DirectCompositionSurfaceWin> egl_surface =
-            make_scoped_refptr(new DirectCompositionSurfaceWin(
-                std::move(vsync_provider), delegate, surface_handle));
-        if (!egl_surface->Initialize())
-          return nullptr;
-        surface = egl_surface;
-      } else {
-        scoped_refptr<ChildWindowSurfaceWin> egl_surface =
-            make_scoped_refptr(new ChildWindowSurfaceWin(
-                std::move(vsync_provider), delegate, surface_handle));
-        if (!egl_surface->Initialize())
-          return nullptr;
-        surface = egl_surface;
-      }
+      scoped_refptr<DirectCompositionSurfaceWin> egl_surface =
+          make_scoped_refptr(new DirectCompositionSurfaceWin(
+              std::move(vsync_provider), delegate, surface_handle));
+      if (!egl_surface->Initialize())
+        return nullptr;
+      surface = egl_surface;
     } else {
       surface = gl::init::CreateNativeViewGLSurfaceEGL(
           surface_handle, std::move(vsync_provider));