Enable cropping window capturing for Win7 when Aero is disabled.

webrtc/modules/desktop_capture/cropping_window_capturer_win.cc

 /*
  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 101 matching lines @@
       const DesktopCaptureOptions& options)
       : CroppingWindowCapturer(options) {}
 
  private:
   bool ShouldUseScreenCapturer() override;
   DesktopRect GetWindowRectInVirtualScreen() override;
 
   // The region from GetWindowRgn in the desktop coordinate if the region is
   // rectangular, or the rect from GetWindowRect if the region is not set.
   DesktopRect window_region_rect_;
+
+  AeroChecker aero_checker_;
 };
 
 bool CroppingWindowCapturerWin::ShouldUseScreenCapturer() {
-  if (!rtc::IsWindows8OrLater())
+  if (!rtc::IsWindows8OrLater() && aero_checker_.IsAeroEnabled())
     return false;
 
   // Check if the window is a translucent layered window.
   HWND selected = reinterpret_cast<HWND>(selected_window());
   LONG window_ex_style = GetWindowLong(selected, GWL_EXSTYLE);
   if (window_ex_style & WS_EX_LAYERED) {
     COLORREF color_ref_key = 0;
     BYTE alpha = 0;
     DWORD flags = 0;
 
@@ skipping 71 matching lines @@
 
 }  // namespace
 
 // static
 WindowCapturer*
 CroppingWindowCapturer::Create(const DesktopCaptureOptions& options) {
   return new CroppingWindowCapturerWin(options);
 }
 
 }  // namespace webrtc