Add keepalive for on screen keyboard

content/browser/renderer_host/render_widget_host_view_aura.cc

 // Copyright (c) 2012 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/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include <set>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 1694 matching lines @@
   // but it is not necessary here because the final target view is responsible
   // for converting before computing the final transform.
   return delegated_frame_host_->TransformPointToCoordSpaceForView(
       point, target_view, transformed_point);
 }
 
 void RenderWidgetHostViewAura::FocusedNodeChanged(
     bool editable,
     const gfx::Rect& node_bounds_in_screen) {
 #if defined(OS_WIN)
-  if (!editable && virtual_keyboard_requested_) {
+  if (!editable && virtual_keyboard_requested_ &&
+      !node_bounds_in_screen.IsEmpty()) {
     virtual_keyboard_requested_ = false;
 
     RenderViewHost* rvh = RenderViewHost::From(host_);
     if (rvh && rvh->GetDelegate())
       rvh->GetDelegate()->SetIsVirtualKeyboardRequested(false);
 
     DCHECK(ui::OnScreenKeyboardDisplayManager::GetInstance());
     ui::OnScreenKeyboardDisplayManager::GetInstance()->DismissVirtualKeyboard();
   }
 #endif
@@ skipping 703 matching lines @@
 
 void RenderWidgetHostViewAura::ScrollFocusedEditableNodeIntoRect(
     const gfx::Rect& node_rect) {
   RenderFrameHostImpl* rfh = GetFocusedFrame();
   if (rfh) {
     rfh->GetFrameInputHandler()->ScrollFocusedEditableNodeIntoRect(node_rect);
   }
 }
 
 }  // namespace content