Change Size::IsEmpty() to be consistent with Rect::IsEmpty()

base/gfx/rect_unittest.cc

 // Copyright (c) 2006-2008 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 "base/gfx/rect.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 typedef testing::Test RectTest;
 
@@ skipping 249 matching lines @@
       gfx::Rect(10, 10, 20, 20).Subtract(
       gfx::Rect(10, 10, 10, 30)).Equals(
       gfx::Rect(20, 10, 10, 20)));
 
   // Complete intersection in the y-direction
   EXPECT_TRUE(
       gfx::Rect(10, 10, 20, 20).Subtract(
       gfx::Rect(5, 5, 20, 30)).Equals(
       gfx::Rect(25, 10, 5, 20)));
 }
+
+TEST(RectTest, IsEmpty) {
+  EXPECT_TRUE(gfx::Rect(0, 0, 0, 0).IsEmpty());
+  EXPECT_TRUE(gfx::Rect(0, 0, 0, 0).size().IsEmpty());
+  EXPECT_TRUE(gfx::Rect(0, 0, 10, 0).IsEmpty());
+  EXPECT_TRUE(gfx::Rect(0, 0, 10, 0).size().IsEmpty());
+  EXPECT_TRUE(gfx::Rect(0, 0, 0, 10).IsEmpty());
+  EXPECT_TRUE(gfx::Rect(0, 0, 0, 10).size().IsEmpty());
+  EXPECT_FALSE(gfx::Rect(0, 0, 10, 10).IsEmpty());
+  EXPECT_FALSE(gfx::Rect(0, 0, 10, 10).size().IsEmpty());
+}