Revert 167255 - ui: Remove gfx::Size::ClampToNonNegative, prevent negative sizes always.

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/rect_conversions.h"
 #include "ui/gfx/skia_util.h"
 
@@ skipping 415 matching lines @@
       std::numeric_limits<float>::quiet_NaN(),
       std::numeric_limits<float>::quiet_NaN(),
       std::numeric_limits<float>::quiet_NaN(),
       std::numeric_limits<float>::quiet_NaN(),
       std::numeric_limits<float>::quiet_NaN() },
     { 3, 3, 3, 3,
       std::numeric_limits<float>::max(),
       std::numeric_limits<float>::max(),
       std::numeric_limits<float>::max(),
       std::numeric_limits<float>::max(),
-      std::numeric_limits<float>::max() }
+      std::numeric_limits<float>::max() },
+    { 3, 3, 3, 3,
+      -1.0f,
+      -3.0f, -3.0f, 0.0f, 0.0f }
   };
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i) {
     Rect r1(tests[i].x1, tests[i].y1, tests[i].w1, tests[i].h1);
     RectF r2(tests[i].x2, tests[i].y2, tests[i].w2, tests[i].h2);
 
     RectF scaled = ScaleRect(r1, tests[i].scale);
     EXPECT_FLOAT_AND_NAN_EQ(r2.x(), scaled.x());
     EXPECT_FLOAT_AND_NAN_EQ(r2.y(), scaled.y());
     EXPECT_FLOAT_AND_NAN_EQ(r2.width(), scaled.width());
@@ skipping 268 matching lines @@
             (Vector2dF(1.1f, -1.1f) + f).ToString());
   f += Vector2dF(1.1f, -1.1f);
   EXPECT_EQ(RectF(2.2f, 1.1f, 3.3f, 4.4f).ToString(), f.ToString());
   EXPECT_EQ(RectF(1.1f, 2.2f, 3.3f, 4.4f).ToString(),
             (f - Vector2dF(1.1f, -1.1f)).ToString());
   f -= Vector2dF(1.1f, -1.1f);
   EXPECT_EQ(RectF(1.1f, 2.2f, 3.3f, 4.4f).ToString(), f.ToString());
 }
 
 }  // namespace gfx