Vertically center the cap height of multi-line text.

ui/gfx/render_text.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/render_text.h"
 
 #include <limits.h>
 
 #include <algorithm>
 #include <climits>
@@ skipping 1185 matching lines @@
         (cursor_enabled_ ? 1 : 0) :
         GetContentWidth();
     offset.set_x(display_rect().width() - width);
     // Put any extra margin pixel on the left to match legacy behavior.
     if (horizontal_alignment == ALIGN_CENTER)
       offset.set_x((offset.x() + 1) / 2);
   }
 
   // Vertically center the text.
   if (multiline_) {
-    const int text_height = lines_.back().preceding_heights +
-        lines_.back().size.height();
-    offset.set_y((display_rect_.height() - text_height) / 2);
+    const int line_height = lines_.back().size.height();
+    const int text_height = lines_.back().preceding_heights + line_height;
+    const int extra_space = display_rect_.height() - text_height;
+    const int centering_baseline =
+        DetermineBaselineCenteringText(line_height + extra_space, font_list());
+    offset.set_y(centering_baseline - GetDisplayTextBaseline());
   } else {
     offset.set_y(GetBaseline() - GetDisplayTextBaseline());
   }
 
   return offset;
 }
 
 void RenderText::ApplyFadeEffects(internal::SkiaTextRenderer* renderer) {
   const int width = display_rect().width();
   if (multiline() || elide_behavior_ != FADE_TAIL || GetContentWidth() <= width)
@@ skipping 420 matching lines @@
 
   for (; range_max < length; ++range_max)
     if (iter.IsEndOfWord(range_max) || iter.IsStartOfWord(range_max))
       break;
 
   return range.is_reversed() ? Range(range_max, range_min)
                              : Range(range_min, range_max);
 }
 
 }  // namespace gfx