Fix OSK flickering issue

content/renderer/render_frame_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/render_frame_impl.h"
 
 #include <map>
 #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"
 #include "base/debug/dump_without_crashing.h"
 #include "base/i18n/char_iterator.h"
 #include "base/metrics/histogram.h"
 #include "base/process/process.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
@@ skipping 3093 matching lines @@
   if (is_empty_selection)
     selection_text_.clear();
 
   // UpdateTextInputState should be called before SyncSelectionIfRequired.
   // UpdateTextInputState may send TextInputStateChanged to notify the focus
   // was changed, and SyncSelectionIfRequired may send SelectionChanged
   // to notify the selection was changed.  Focus change should be notified
   // 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(
     blink::WebColorChooserClient* client,
     const blink::WebColor& initial_color,
     const blink::WebVector<blink::WebColorSuggestion>& suggestions) {
   RendererWebColorChooserImpl* color_chooser =
       new RendererWebColorChooserImpl(this, client);
   std::vector<ColorSuggestion> color_suggestions;
   for (size_t i = 0; i < suggestions.size(); i++) {
@@ skipping 2073 matching lines @@
   mojo::ServiceProviderPtr service_provider;
   mojo::URLRequestPtr request(mojo::URLRequest::New());
   request->url = mojo::String::From(url);
   mojo_shell_->ConnectToApplication(request.Pass(), GetProxy(&service_provider),
                                     nullptr, nullptr,
                                     base::Bind(&OnGotContentHandlerID));
   return service_provider.Pass();
 }
 
 }  // namespace content