Fix OSK flickering issue

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 aaccc4354fb359f545106b1e21036860f2f98372..5a91ae6981146c401dc89915a334b510e2732a41 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "base/auto_reset.h"
+#include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/alias.h"
 #include "base/debug/asan_invalid_access.h"
@@ -3121,7 +3122,9 @@ void RenderFrameImpl::didChangeSelection(bool is_empty_selection) {
   // before selection change.
   GetRenderWidget()->UpdateTextInputState(
       RenderWidget::NO_SHOW_IME, RenderWidget::FROM_NON_IME);
-  SyncSelectionIfRequired();
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE,
+      base::Bind(&RenderFrameImpl::SyncSelectionIfRequired, AsWeakPtr()));
 }
 
 blink::WebColorChooser* RenderFrameImpl::createColorChooser(