[Views] Make ConvertPointToScreen work without Widget.

ui/views/view.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.
 
 #define _USE_MATH_DEFINES // For VC++ to get M_PI. This has to be first.
 
 #include "ui/views/view.h"
 
 #include <algorithm>
 #include <cmath>
@@ skipping 661 matching lines @@
 
   dest->ConvertPointFromAncestor(NULL, p);
 }
 
 // static
 void View::ConvertPointToScreen(const View* src, gfx::Point* p) {
   DCHECK(src);
   DCHECK(p);
 
   // If the view is not connected to a tree, there's nothing we can do.
+  ConvertPointToWidget(src, p);
   const Widget* widget = src->GetWidget();
-  if (widget) {
-    ConvertPointToWidget(src, p);
+  if (widget)
     *p += widget->GetClientAreaBoundsInScreen().OffsetFromOrigin();
-  }
 }
 
 // static
 void View::ConvertPointFromScreen(const View* dst, gfx::Point* p) {
   DCHECK(dst);
   DCHECK(p);
 
   const views::Widget* widget = dst->GetWidget();
-  if (!widget)
-    return;
-  *p -= widget->GetClientAreaBoundsInScreen().OffsetFromOrigin();
+  if (widget)
+    *p -= widget->GetClientAreaBoundsInScreen().OffsetFromOrigin();
   views::View::ConvertPointFromWidget(dst, p);
 }
 
 gfx::Rect View::ConvertRectToParent(const gfx::Rect& rect) const {
   gfx::RectF x_rect = rect;
   GetTransform().TransformRect(&x_rect);
   x_rect.Offset(GetMirroredPosition().OffsetFromOrigin());
   // Pixels we partially occupy in the parent should be included.
   return gfx::ToEnclosingRect(x_rect);
 }
@@ skipping 1641 matching lines @@
   // Message the RootView to do the drag and drop. That way if we're removed
   // the RootView can detect it and avoid calling us back.
   gfx::Point widget_location(event.location());
   ConvertPointToWidget(this, &widget_location);
   widget->RunShellDrag(this, data, widget_location, drag_operations, source);
   // WARNING: we may have been deleted.
   return true;
 }
 
 }  // namespace views