(Not ready for review!) Toolbar and views high dpi support.

ui/views/drag_utils.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/views/drag_utils.h"
 
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/size.h"
 
 #if defined(USE_AURA)
@@ skipping 17 matching lines @@
   // The following code should work on other platforms as well. But we do not
   // yet care about device scale factor on other platforms. So to keep drag and
   // drop behavior on other platforms un-touched, we wrap this in the #if guard.
   if (widget && widget->GetNativeView()) {
     gfx::NativeView view = widget->GetNativeView();
     gfx::Display display = gfx::Screen::GetScreenFor(view)->
         GetDisplayNearestWindow(view);
     device_scale_factor = ui::GetScaleFactorFromScale(
         display.device_scale_factor());
   }
+#elif defined(ENABLE_HIDPI)
+  device_scale_factor = ui::GetMaxScaleFactor();
 #endif
   return device_scale_factor;
 }
 
 namespace views {
 
 void RunShellDrag(gfx::NativeView view,
                   const ui::OSExchangeData& data,
                   const gfx::Point& location,
                   int operation,
@@ skipping 17 matching lines @@
 }
 
 gfx::Canvas* GetCanvasForDragImage(views::Widget* widget,
                                    const gfx::Size& canvas_size) {
   ui::ScaleFactor device_scale_factor =
       GetDeviceScaleFactorForNativeView(widget);
   return new gfx::Canvas(canvas_size, device_scale_factor, false);
 }
 
 }  // namespace views