Fix OSK flickering issue

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 121039660409f696b70c8ac37874b504498fb957..265a7be1ff660485b707124e1dfbb55437e8e7ea 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -1887,13 +1887,24 @@ void RenderWidget::UpdateTextInputState(ShowIme show_ime,
   TRACE_EVENT0("renderer", "RenderWidget::UpdateTextInputState");
   if (handling_ime_event_)
     return;

[aelias_OOO_until_Jul13, 2015/10/22 00:07:56]

Prior to this early return, I think we should do 'need_show_ime_ |= (show_ime ==
SHOW_IME_IF_NEEDED); text_field_is_dirty_ |= (change_source == FROM_NON_IME);'. 
Otherwise a show request could be lost.

[Changwan Ryu, 2015/10/22 02:46:00]

Hmm... Since we do not store show_ime_, I came up with
pending_show_ime_if_needed_ so that show_ime in an ignored state update can be
stored.

-  ui::TextInputType new_type = GetTextInputType();
-  if (IsDateTimeInput(new_type))
-    return;  // Not considered as a text input field in WebKit/Chromium.
 
+  // We could be called in the middle of focus change, or in some other
+  // intermediary state.
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE, base::Bind(&RenderWidget::UpdateTextInputStateInternal, this,
+                            show_ime, change_source));
+}
+
+void RenderWidget::UpdateTextInputStateInternal(ShowIme show_ime,
+                                                ChangeSource change_source) {
   blink::WebTextInputInfo new_info;
   if (webwidget_)
     new_info = webwidget_->textInputInfo();
+
+  ui::TextInputType new_type = WebKitToUiTextInputType(new_info.type);
+  if (IsDateTimeInput(new_type))
+    return;  // Not considered as a text input field in WebKit/Chromium.
+
   const ui::TextInputMode new_mode = ConvertInputMode(new_info.inputMode);
 
   bool new_can_compose_inline = CanComposeInline();