Split DirectCompositionSurfaceWin into two parts.

ui/gl/scoped_make_current.cc

Index: ui/gl/scoped_make_current.cc
diff --git a/ui/gl/scoped_make_current.cc b/ui/gl/scoped_make_current.cc
index e75a0416e518e95381821ae644a258b4b9a0a980..d93e3171447c86b30342e2dd48d436625e978985 100644
--- a/ui/gl/scoped_make_current.cc
+++ b/ui/gl/scoped_make_current.cc
@@ -35,4 +35,16 @@ bool ScopedMakeCurrent::Succeeded() const {
   return succeeded_;
 }
 
+ScopedReleaseCurrent::ScopedReleaseCurrent(gl::GLSurface* this_surface) {
+  gl::GLContext* current_context = gl::GLContext::GetCurrent();
+  bool was_current =
+      current_context && current_context->IsCurrent(this_surface);
+  if (was_current) {
+    make_current_.emplace(current_context, this_surface);
+    current_context->ReleaseCurrent(this_surface);
+  }
+}
+
+ScopedReleaseCurrent::~ScopedReleaseCurrent() {}
+
 }  // namespace ui