PlatformFontWin::DeriveFontWithHeight insensitive to base font's height

ui/gfx/platform_font_win_unittest.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/platform_font_win.h"
 
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/font.h"
@@ skipping 51 matching lines @@
     // Test that deriving from the new font has the expected result.
     Font rederived_font = derived_font.Derive(1, 0);
     expected_font = Font(derived_font.GetFontName(),
                          derived_font.GetFontSize() + 1);
     EXPECT_EQ(expected_font.GetFontName(), rederived_font.GetFontName());
     EXPECT_EQ(expected_font.GetFontSize(), rederived_font.GetFontSize());
     EXPECT_EQ(expected_font.GetHeight(), rederived_font.GetHeight());
   }
 }
 
+TEST(PlatformFontWinTest, DeriveFontWithHeight_Consistency) {
+  gfx::Font arial_12("Arial", 12);
+  ASSERT_GT(16, arial_12.GetHeight());
+  gfx::Font derived_1 = static_cast<PlatformFontWin*>(
+      arial_12.platform_font())->DeriveFontWithHeight(16, 0);
+
+  gfx::Font arial_15("Arial", 15);
+  ASSERT_LT(16, arial_15.GetHeight());
+  gfx::Font derived_2 = static_cast<PlatformFontWin*>(
+      arial_15.platform_font())->DeriveFontWithHeight(16, 0);
+
+  EXPECT_EQ(derived_1.GetFontSize(), derived_2.GetFontSize());
+  EXPECT_EQ(16, derived_1.GetHeight());
+  EXPECT_EQ(16, derived_2.GetHeight());
+}
+
 // Callback function used by DeriveFontWithHeight_MinSize() below.
 static int GetMinFontSize() {
   return 10;
 }
 
 TEST(PlatformFontWinTest, DeriveFontWithHeight_MinSize) {
   PlatformFontWin::GetMinimumFontSizeCallback old_callback =
     PlatformFontWin::get_minimum_font_size_callback;
   PlatformFontWin::get_minimum_font_size_callback = &GetMinFontSize;
 
@@ skipping 13 matching lines @@
 TEST(PlatformFontWinTest, DeriveFontWithHeight_TooSmall) {
   const Font base_font;
   PlatformFontWin* platform_font =
       static_cast<PlatformFontWin*>(base_font.platform_font());
 
   const Font derived_font = platform_font->DeriveFontWithHeight(1, 0);
   EXPECT_GT(derived_font.GetHeight(), 1);
 }
 
 }  // namespace gfx