Vertically center multi-line RenderTextHarfBuzz that uses SetMinLineHeight().

ui/gfx/render_text.h

Index: ui/gfx/render_text.h
diff --git a/ui/gfx/render_text.h b/ui/gfx/render_text.h
index f24633c2583e27c07285ed3c93cd5d605b413207..00fe00c8e734d7bfc0eebaf5bbaee6601c36ef8e 100644
--- a/ui/gfx/render_text.h
+++ b/ui/gfx/render_text.h
@@ -680,6 +680,10 @@ class GFX_EXPORT RenderText {
                                  size_t caret_pos,
                                  LogicalCursorDirection caret_affinity);
 
+  // Returns the baseline, with which the text best appears vertically centered.
+  static int DetermineBaselineCenteringText(const int display_height,
+                                            const FontList& font_list);
+
  private:
   friend class test::RenderTextTestApi;