Filled in missing dmSize, dmDriverExtra values for EnumDisplaySettings call

ui/gl/gl_surface_win.cc

 // Copyright (c) 2012 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 "ui/gl/gl_surface.h"
 
 #include <dwmapi.h>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 100 matching lines @@
     // favor the DWM value because any additional frames produced will be
     // discarded by the OS. If the display refresh rate is lower, however, we
     // can use that to limit the frames we produce more intelligently.
     // If DWM compositing is not active we will always use the display refresh.
     HMONITOR monitor = MonitorFromWindow(window_, MONITOR_DEFAULTTONEAREST);
     MONITORINFOEX monitor_info;
     monitor_info.cbSize = sizeof(MONITORINFOEX);
     BOOL result = GetMonitorInfo(monitor, &monitor_info);
     if (result) {
       DEVMODE display_info;
+      display_info.dmSize = sizeof(DEVMODE);
+      display_info.dmDriverExtra = 0;
       result = EnumDisplaySettings(monitor_info.szDevice, ENUM_CURRENT_SETTINGS,
           &display_info);
       if (result && display_info.dmDisplayFrequency > 1) {
         base::TimeDelta display_interval = base::TimeDelta::FromMicroseconds(
             (1.0 / static_cast<double>(display_info.dmDisplayFrequency)) *
             base::Time::kMicrosecondsPerSecond);
 
         if (!dwm_active || display_interval > interval) {
           interval = display_interval;
         }
@@ skipping 216 matching lines @@
 }
 
 EGLNativeDisplayType GetPlatformDefaultEGLNativeDisplay() {
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableD3D11) ||
       CommandLine::ForCurrentProcess()->HasSwitch(switches::kUseWarp))
     return GetDC(NULL);
   return EGL_D3D11_ELSE_D3D9_DISPLAY_ANGLE;
 }
 
 }  // namespace gfx