Add HiDPI flag for Windows

ui/base/ui_base_switches.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/base/ui_base_switches.h"
 
 namespace switches {
 
 // Disables use of DWM composition for top level windows.
 const char kDisableDwmComposition[] = "disable-dwm-composition";
@@ skipping 21 matching lines @@
 
 // Enables touch event based drag and drop.
 const char kEnableTouchDragDrop[] = "enable-touch-drag-drop";
 
 // Enables controls that support touch base text editing.
 const char kEnableTouchEditing[] = "enable-touch-editing";
 
 // Enables the Views textfield on Windows.
 const char kEnableViewsTextfield[] = "enable-views-textfield";
 
+// Enables/Disables High DPI support (windows)
+const char kHighDPISupport[] = "high-dpi-support";
+
 // Overrides the device scale factor for the browser UI and the contents.
 const char kForceDeviceScaleFactor[] = "force-device-scale-factor";
 
 // If a resource is requested at a scale factor at which it is not available
 // or the resource is the incorrect size (based on the size of the 1x resource),
 // generates the missing resource and applies a red mask to the generated
 // resource. Resources for which hidpi is not supported because of software
 // reasons will show up pixelated.
 const char kHighlightMissingScaledResources[] =
     "highlight-missing-scaled-resources";
@@ skipping 48 matching lines @@
 #endif
 
 #if defined(TOOLKIT_VIEWS) && defined(OS_LINUX)
 // Tells chrome to interpret events from these devices as touch events. Only
 // available with XInput 2 (i.e. X server 1.8 or above). The id's of the
 // devices can be retrieved from 'xinput list'.
 const char kTouchDevices[] = "touch-devices";
 #endif
 
 }  // namespace switches