RenderText: Add a test to ensure strings fit their own widths

ui/gfx/render_text.h

 // 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.
 
 #ifndef UI_GFX_RENDER_TEXT_H_
 #define UI_GFX_RENDER_TEXT_H_
 
 #include <algorithm>
 #include <cstring>
 #include <string>
@@ skipping 563 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_SufficientWidth);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_Newline);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, GlyphBounds);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, HarfBuzz_GlyphBounds);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest,
                            MoveCursorLeftRight_MeiryoUILigatures);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Win_LogicalClusters);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, SameFontForParentheses);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, BreakRunsByUnicodeBlocks);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, PangoAttributes);
+  FRIEND_TEST_ALL_PREFIXES(RenderTextTest, StringFitsOwnWidth);
 
   // Creates a platform-specific RenderText instance.
   static RenderText* CreateNativeInstance();
 
   // Set the cursor to |position|, with the caret trailing the previous
   // grapheme, or if there is no previous grapheme, leading the cursor position.
   // If |select| is false, the selection start is moved to the same position.
   // If the |position| is not a cursorable position (not on grapheme boundary),
   // it is a NO-OP.
   void MoveCursorTo(size_t position, bool select);
@@ skipping 128 matching lines @@
   // Lines computed by EnsureLayout. These should be invalidated with
   // ResetLayout and on |display_rect_| changes.
   std::vector<internal::Line> lines_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_