ui: ToEnclosingRect(empty rect) should return an empty rect.

ui/gfx/rect_conversions.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/gfx/rect_conversions.h"
 
 #include <cmath>
 
 #include "base/logging.h"
 #include "ui/gfx/safe_integer_conversions.h"
 
 namespace gfx {
 
 Rect ToEnclosingRect(const RectF& rect) {
   int min_x = ToFlooredInt(rect.x());
   int min_y = ToFlooredInt(rect.y());
   float max_x = rect.right();
   float max_y = rect.bottom();
-  int width = std::max(ToCeiledInt(max_x) - min_x, 0);
-  int height = std::max(ToCeiledInt(max_y) - min_y, 0);
+  int width = rect.width() == 0 ? 0 : std::max(ToCeiledInt(max_x) - min_x, 0);
+  int height = rect.height() == 0 ? 0 : std::max(ToCeiledInt(max_y) - min_y, 0);
   return Rect(min_x, min_y, width, height);
 }
 
 Rect ToEnclosedRect(const RectF& rect) {
   int min_x = ToCeiledInt(rect.x());
   int min_y = ToCeiledInt(rect.y());
   float max_x = rect.right();
   float max_y = rect.bottom();
   int width = std::max(ToFlooredInt(max_x) - min_x, 0);
   int height = std::max(ToFlooredInt(max_y) - min_y, 0);
@@ skipping 41 matching lines @@
 
 Rect ToFlooredRectDeprecated(const RectF& rect) {
   return Rect(ToFlooredInt(rect.x()),
               ToFlooredInt(rect.y()),
               ToFlooredInt(rect.width()),
               ToFlooredInt(rect.height()));
 }
 
 }  // namespace gfx