Ensure that NativeWidgetWin::OnPaint calls ValidateRect; workaround for crbug.com/93530.

views/widget/native_widget_win.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "views/widget/native_widget_win.h"
 
 #include <dwmapi.h>
 #include <shellapi.h>
 
 #include <algorithm>
@@ skipping 1756 matching lines @@
   if (GetUpdateRect(hwnd(), &dirty_rect, FALSE) &&
       !IsRectEmpty(&dirty_rect)) {
     if (delegate_->OnNativeWidgetPaintAccelerated(
         gfx::Rect(dirty_rect))) {
       ValidateRect(hwnd(), NULL);
     } else {
       scoped_ptr<gfx::CanvasPaint> canvas(
           gfx::CanvasPaint::CreateCanvasPaint(hwnd()));
       delegate_->OnNativeWidgetPaint(canvas->AsCanvas());
     }
+  } else {
+    // TODO(msw): Find a better solution for this crbug.com/93530 workaround.
+    // Some scenarios otherwise fail to validate minimized app/popup windows.
+    ValidateRect(hwnd(), NULL);
   }
 }
 
 LRESULT NativeWidgetWin::OnPowerBroadcast(DWORD power_event, DWORD data) {
   base::SystemMonitor* monitor = base::SystemMonitor::Get();
   if (monitor)
     monitor->ProcessWmPowerBroadcastMessage(power_event);
   SetMsgHandled(FALSE);
   return 0;
 }
@@ skipping 729 matching lines @@
   return (GetKeyState(VK_LBUTTON) & 0x80) ||
     (GetKeyState(VK_RBUTTON) & 0x80) ||
     (GetKeyState(VK_MBUTTON) & 0x80) ||
     (GetKeyState(VK_XBUTTON1) & 0x80) ||
     (GetKeyState(VK_XBUTTON2) & 0x80);
 }
 
 }  // namespace internal
 
 }  // namespace views