Adjust gfx::Rect's width and height to avoid integer overflow

ui/gfx/geometry/rect_unittest.cc

 // Copyright (c) 2013 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 <limits>
 
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "build/build_config.h"
@@ skipping 897 matching lines @@
   EXPECT_FLOAT_EQ(
       0.0f, f.ManhattanInternalDistance(gfx::RectF(-1.0f, 0.0f, 1.1f, 1.0f)));
   EXPECT_FLOAT_EQ(
       0.1f + kEpsilon,
       f.ManhattanInternalDistance(gfx::RectF(-1.5f, 0.0f, 1.4f, 1.0f)));
   EXPECT_FLOAT_EQ(
       kEpsilon,
       f.ManhattanInternalDistance(gfx::RectF(-1.5f, 0.0f, 1.5f, 1.0f)));
 }
 
+TEST(RectTest, IntegerOverflow) {
+  Rect height_overflow(0, std::numeric_limits<int>::max() - 10, 100, 100);
+  EXPECT_EQ(10, height_overflow.height());

[danakj, 2016/08/25 17:59:21]

can you EXPECT_EQ(max(), height_overflow.bottom()) as well, ditto below? that
will help explain it to readers

[sunxd, 2016/08/25 19:25:09]

Acknowledged.

+
+  Rect width_overflow(std::numeric_limits<int>::max() - 10, 0, 100, 100);
+  EXPECT_EQ(10, width_overflow.width());
+
+  Rect size_height_overflow(Point(0, std::numeric_limits<int>::max() - 10),
+                            Size(100, 100));
+  EXPECT_EQ(10, size_height_overflow.height());
+
+  Rect size_width_overflow(Point(std::numeric_limits<int>::max() - 10, 0),
+                           Size(100, 100));
+  EXPECT_EQ(10, size_width_overflow.width());
+}
+
 }  // namespace gfx