Introduce ThreadedInputConnection behind a switch

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 903ce2da0e172e050bee206e2fc7919ee5f02149..d292e09f119b5782f8c0f5a0f9df0efe83f51937 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1614,6 +1614,7 @@ void RenderFrameImpl::OnSetEditableSelectionOffsets(int start, int end) {
   base::AutoReset<bool> handling_select_range(&handling_select_range_, true);
   if (!GetRenderWidget()->ShouldHandleImeEvent())
     return;
+  LOG(ERROR) << "XXX OnSetEditableSelectionOffsets";
   ImeEventGuard guard(GetRenderWidget());
   frame_->setEditableSelectionOffsets(start, end);
 }
@@ -1623,6 +1624,7 @@ void RenderFrameImpl::OnSetCompositionFromExistingText(
     const std::vector<blink::WebCompositionUnderline>& underlines) {
   if (!GetRenderWidget()->ShouldHandleImeEvent())
     return;
+  LOG(ERROR) << "XXX OnSetCompositionFromExistingText";
   ImeEventGuard guard(GetRenderWidget());
   frame_->setCompositionFromExistingText(start, end, underlines);
 }
@@ -1637,6 +1639,7 @@ void RenderFrameImpl::OnExtendSelectionAndDelete(int before, int after) {
 
   DCHECK(!WebUserGestureIndicator::isProcessingUserGesture());
 
+  LOG(ERROR) << "XXX OnExtendSelectionAndDelete";
   ImeEventGuard guard(GetRenderWidget());
   blink::WebScopedUserGesture gesture_indicator;
   frame_->extendSelectionAndDelete(before, after);