Vertically center the cap height of multi-line text.

ui/gfx/render_text.cc

Index: ui/gfx/render_text.cc
diff --git a/ui/gfx/render_text.cc b/ui/gfx/render_text.cc
index dfac16495193edac4772265f9f6903c821d1d734..830bbd120c7852cdb2c9212ea8918f90cc6604a3 100644
--- a/ui/gfx/render_text.cc
+++ b/ui/gfx/render_text.cc
@@ -1203,9 +1203,12 @@ Vector2d RenderText::GetAlignmentOffset(size_t line_number) {
 
   // 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());
   }