Always use DirectCompositionSurfaceWin when using DirectComposition

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 706fa86e2f402fc45f1a2089b44fd4926071858b..fe96f217b42863dc02b3836984ab732991e30ac0 100644
--- a/gpu/ipc/service/direct_composition_surface_win.cc
+++ b/gpu/ipc/service/direct_composition_surface_win.cc
@@ -991,10 +991,23 @@ DirectCompositionSurfaceWin::~DirectCompositionSurfaceWin() {
 
 // static
 bool DirectCompositionSurfaceWin::AreOverlaysSupported() {
-  if (!HardwareSupportsOverlays())
-    return false;
+  static bool initialized;
+  static bool overlays_supported;
+  if (initialized)
+    return overlays_supported;
+
+  initialized = true;
 
-  return base::FeatureList::IsEnabled(switches::kDirectCompositionOverlays);
+  if (HardwareSupportsOverlays()) {
+    overlays_supported =

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

nit: overlays_supported = base::FeatureList::IsEnabled(...) &&
HardwareSupportsOverlays()

+        base::FeatureList::IsEnabled(switches::kDirectCompositionOverlays);
+  } else {
+    overlays_supported = false;
+  }
+
+  UMA_HISTOGRAM_BOOLEAN("GPU.DirectComposition.OverlaysSupported",
+                        overlays_supported);
+  return overlays_supported;
 }
 
 // static
@@ -1178,6 +1191,10 @@ bool DirectCompositionSurfaceWin::SupportsDCLayers() const {
   return true;
 }
 
+bool DirectCompositionSurfaceWin::UseOverlaysForVideo() const {
+  return AreOverlaysSupported();
+}
+
 bool DirectCompositionSurfaceWin::SetDrawRectangle(const gfx::Rect& rectangle) {
   if (root_surface_)
     return root_surface_->SetDrawRectangle(rectangle);