cleaning up osr pt1

atom/browser/osr_render_widget_host_view_win.cc

@@ -0,0 +1,41 @@
+// Copyright (c) 2013 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include <windows.h>
+
+#include "atom/browser/osr_render_widget_host_view.h"
+
+namespace atom {
+
+class DummyWindowWin : public gfx::WindowImpl {
+public:
+  DummyWindowWin() {
+    // Create a hidden 1x1 borderless window.
+    set_window_style(WS_POPUP | WS_SYSMENU);
+    Init(NULL, gfx::Rect(0, 0, 1, 1));
+  }
+
+  ~DummyWindowWin() override {
+    DestroyWindow(hwnd());
+  }
+
+private:
+  CR_BEGIN_MSG_MAP_EX(DummyWindowWin)
+    CR_MSG_WM_PAINT(OnPaint)
+  CR_END_MSG_MAP()
+
+  void OnPaint(HDC dc) {
+    ValidateRect(hwnd(), NULL);
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(DummyWindowWin);
+};
+
+void OffScreenRenderWidgetHostView::CreatePlatformWidget() {
+  DCHECK(!window_);
+  window_.reset(new DummyWindowWin());
+  compositor_widget_ = window_->hwnd();
+}
+
+}  // namespace atom