Move ScreenCapturer 'real' tests out of screen_capturer_unittest.cc.

webrtc/modules/desktop_capture/screen_drawer_win.cc

 /*
  *  Copyright (c) 2016 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.
  */
 
 #include <windows.h>
 
 #include <memory>
 
 #include "webrtc/modules/desktop_capture/screen_drawer.h"
 #include "webrtc/system_wrappers/include/sleep.h"
 
 namespace webrtc {
 
 namespace {
 
 static constexpr TCHAR kMutexName[] =
     TEXT("Local\\ScreenDrawerWin-da834f82-8044-11e6-ac81-73dcdd1c1869");
 
 class ScreenDrawerLockWin : public ScreenDrawerLock {
  public:
   ScreenDrawerLockWin();
-  ~ScreenDrawerLockWin();
+  ~ScreenDrawerLockWin() override;
 
  private:
   HANDLE mutex_;
 };
 
 ScreenDrawerLockWin::ScreenDrawerLockWin() {
   while (true) {
     mutex_ = CreateMutex(NULL, FALSE, kMutexName);
     if (GetLastError() != ERROR_ALREADY_EXISTS && mutex_ != NULL) {
       break;
@@ skipping 155 matching lines @@
 std::unique_ptr<ScreenDrawerLock> ScreenDrawerLock::Create() {
   return std::unique_ptr<ScreenDrawerLock>(new ScreenDrawerLockWin());
 }
 
 // static
 std::unique_ptr<ScreenDrawer> ScreenDrawer::Create() {
   return std::unique_ptr<ScreenDrawer>(new ScreenDrawerWin());
 }
 
 }  // namespace webrtc