[WIP Approach 1] Straighten up input method reactivation

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 5bde3b184419e453b372dd7994374c0d46c9717c..2218f47107166c7657f104c2b692ebf6425bd9ac 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -337,6 +337,9 @@ class CONTENT_EXPORT RenderWidget
   // |policy| see the comment on MessageDeliveryPolicy.
   void QueueMessage(IPC::Message* msg, MessageDeliveryPolicy policy);
 
+  void CancelComposition();
+  void OnFocusedNodeChanged(bool is_editable, const gfx::Rect& node_bounds);
+
   // Check whether IME thread is being used or not.
   bool IsUsingImeThread();
 
@@ -498,6 +501,9 @@ class CONTENT_EXPORT RenderWidget
   void OnSetFrameSinkId(const cc::FrameSinkId& frame_sink_id);
   void OnHandleCompositorProto(const std::vector<uint8_t>& proto);
 
+  void UpdateTextInputStateInternal(ShowIme show_ime,
+                                    ChangeSource change_source,
+                                    bool ignore_until_ack);
 #if defined(OS_ANDROID)
   // Called when we send IME event that expects an ACK.
   void OnImeEventSentForAck(const blink::WebTextInputInfo& info);
@@ -678,6 +684,13 @@ class CONTENT_EXPORT RenderWidget
   // input state.
   bool ime_in_batch_edit_;
 
+  // Indicates that we will ignore IME related messages from host until the
+  // new text input state update is acked by the host.
+  bool ime_ignore_until_acked_;;
+
+  // A queue of messages to send after we update the text input state.
+  std::vector<IPC::Message*> ime_messages_to_send_after_update_;
+
   // True if we have requested this widget be closed.  No more messages will
   // be sent, except for a Close.
   bool closing_;