Don't subtract border from max size for display rect.

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 510 matching lines @@
   // at the point, returns a nearby word. |baseline_point| should correspond to
   // the baseline point of the leftmost glyph of the |word| in the view's
   // coordinates. Returns false, if no word can be retrieved.
   bool GetDecoratedWordAtPoint(const Point& point,
                                DecoratedText* decorated_word,
                                Point* baseline_point);
 
   // Retrieves the text in the given |range|.
   base::string16 GetTextFromRange(const Range& range) const;
 
+  // Returns the number of text lines, only for unit test.
+  size_t line_size_for_test() const { return lines_.size(); }

[sky, 2016/12/07 17:09:37]

Add to test::RenderTextTestApi ?

[oshima, 2016/12/13 14:22:18]

Extracted to a separate file. PTAL.

+
  protected:
   RenderText();
 
   // NOTE: The value of these accessors may be stale. Please make sure
   // that these fields are up to date before accessing them.
   const base::string16& layout_text() const { return layout_text_; }
   const base::string16& display_text() const { return display_text_; }
   bool text_elided() const { return text_elided_; }
 
   const BreakList<SkColor>& colors() const { return colors_; }
@@ skipping 320 matching lines @@
   // Lines computed by EnsureLayout. These should be invalidated upon
   // OnLayoutTextAttributeChanged and OnDisplayTextAttributeChanged calls.
   std::vector<internal::Line> lines_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_