Add a gyp flag to enable dcheck by default in release without

ui/gfx/rect_unittest.cc

 // Copyright (c) 2011 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 "base/basictypes.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/skia_util.h"
 
 namespace ui {
 
 TEST(RectTest, Contains) {
   static const struct ContainsCase {
     int rect_x;
     int rect_y;
     int rect_width;
     int rect_height;
     int point_x;
     int point_y;
     bool contained;
   } contains_cases[] = {
     {0, 0, 10, 10, 0, 0, true},
     {0, 0, 10, 10, 5, 5, true},
     {0, 0, 10, 10, 9, 9, true},
     {0, 0, 10, 10, 5, 10, false},
     {0, 0, 10, 10, 10, 5, false},
     {0, 0, 10, 10, -1, -1, false},
     {0, 0, 10, 10, 50, 50, false},
-  #ifdef NDEBUG
+  #if defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON)
     {0, 0, -10, -10, 0, 0, false},
-  #endif  // NDEBUG
+  #endif
   };
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(contains_cases); ++i) {
     const ContainsCase& value = contains_cases[i];
     gfx::Rect rect(value.rect_x, value.rect_y,
                    value.rect_width, value.rect_height);
     EXPECT_EQ(value.contained, rect.Contains(value.point_x, value.point_y));
   }
 }
 
 TEST(RectTest, Intersects) {
@@ skipping 281 matching lines @@
 #if defined(OS_WIN)
 TEST(RectTest, ConstructAndAssign) {
   const RECT rect_1 = { 0, 0, 10, 10 };
   const RECT rect_2 = { 0, 0, -10, -10 };
   gfx::Rect test1(rect_1);
   gfx::Rect test2(rect_2);
 }
 #endif
 
 }  // namespace ui