Reland: Update TextSelection for non-user initiated events

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 8cc8e864faf316b0238e3badf395dc5f8adbd956..56b2f77c7e456369841deb5e06b7eeb20dbcf827 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -1635,6 +1635,7 @@ void RenderWidget::OnImeSetComposition(
   }
 #endif
   ImeEventGuard guard(this);
+  input_handler_->set_ime_composition_replacement(replacement_range.IsValid());
   blink::WebInputMethodController* controller = GetInputMethodController();
   if (!controller ||
       !controller->SetComposition(
@@ -1649,6 +1650,7 @@ void RenderWidget::OnImeSetComposition(
     // sure we are in a consistent state.
     Send(new InputHostMsg_ImeCancelComposition(routing_id()));
   }
+  input_handler_->set_ime_composition_replacement(false);
   UpdateCompositionInfo(false /* not an immediate request */);
 }