Label selection experiment

ui/gfx/render_text_harfbuzz.cc

Index: ui/gfx/render_text_harfbuzz.cc
diff --git a/ui/gfx/render_text_harfbuzz.cc b/ui/gfx/render_text_harfbuzz.cc
index 5269f4ac248d507f70ee74b54826d4387da8a564..99b63d86dcb6e582f41b9c34d12dbda3dfb42375 100644
--- a/ui/gfx/render_text_harfbuzz.cc
+++ b/ui/gfx/render_text_harfbuzz.cc
@@ -845,6 +845,11 @@ SelectionModel RenderTextHarfBuzz::FindCursorPosition(const Point& point) {
   return EdgeSelectionModel(CURSOR_RIGHT);
 }
 
+bool RenderTextHarfBuzz::IsSelectionSupported() const {
+  // Todo(karandeepb): Support multi-line text selection.
+  return !multiline();
+}
+
 std::vector<RenderText::FontSpan> RenderTextHarfBuzz::GetFontSpansForTesting() {
   EnsureLayout();