MacViews: Use RenderTextHarfBuzz only for Textfields

Using RenderTextHarfBuzz for string sizing and eliding on Mac is problematic
because it may not match when drawn by Cocoa, so we use RenderTextMac.
But RenderTextMac does not have support for editing that is needed by
views::Textfield, so use RenderTextHarfBuzz for MacViews textfields.

Review URL: https://codereview.chromium.org/779793006

Cr-Commit-Position: refs/heads/master@{#307396}

1 files changed, 4 insertions, 0 deletions

diff --git a/ui/gfx/render_text_harfbuzz.cc b/ui/gfx/render_text_harfbuzz.cc
index 508655b..b1bcf89 100644
--- a/ui/gfx/render_text_harfbuzz.cc
+++ b/ui/gfx/render_text_harfbuzz.cc
@@ -588,6 +588,10 @@ RenderTextHarfBuzz::RenderTextHarfBuzz()
 
 RenderTextHarfBuzz::~RenderTextHarfBuzz() {}
 
+scoped_ptr<RenderText> RenderTextHarfBuzz::CreateInstanceOfSameType() const {
+  return scoped_ptr<RenderTextHarfBuzz>(new RenderTextHarfBuzz);
+}
+
 Size RenderTextHarfBuzz::GetStringSize() {
   const SizeF size_f = GetStringSizeF();
   return Size(std::ceil(size_f.width()), size_f.height());