Introduce ThreadedInputConnection behind a switch

content/renderer/render_widget.h

 // 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.
 
 #ifndef CONTENT_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 301 matching lines @@
   // This mechanism is not a drop-in replacement for IPC: messages sent this way
   // will not be automatically available to BrowserMessageFilter, for example.
   // FIFO ordering is preserved between messages enqueued with the same
   // |policy|, the ordering between messages enqueued for different policies is
   // undefined.
   //
   // |msg| message to send, ownership of |msg| is transferred.
   // |policy| see the comment on MessageDeliveryPolicy.
   void QueueMessage(IPC::Message* msg, MessageDeliveryPolicy policy);
 
+  // Check whether IME thread is being used or not.
+  bool IsUsingImeThread();
+
   // Handle start and finish of IME event guard.
   void OnImeEventGuardStart(ImeEventGuard* guard);
   void OnImeEventGuardFinish(ImeEventGuard* guard);
 
   // Returns whether we currently should handle an IME event.
   bool ShouldHandleImeEvent();
 
   void SetPopupOriginAdjustmentsForEmulation(
       RenderWidgetScreenMetricsEmulator* emulator);
 
@@ skipping 122 matching lines @@
   void OnShowImeIfNeeded();
   void OnSetSurfaceIdNamespace(uint32_t surface_id_namespace);
   void OnHandleCompositorProto(const std::vector<uint8_t>& proto);
 
 #if defined(OS_ANDROID)
   // Called when we send IME event that expects an ACK.
   void OnImeEventSentForAck(const blink::WebTextInputInfo& info);
 
   // Called by the browser process for every required IME acknowledgement.
   void OnImeEventAck();
+
+  // Called by the browser process to update text input state.
+  void OnRequestTextInputStateUpdate();
 #endif
 
   // Notify the compositor about a change in viewport size. This should be
   // used only with auto resize mode WebWidgets, as normal WebWidgets should
   // go through OnResize.
   void AutoResizeCompositor();
 
   virtual void SetDeviceScaleFactor(float device_scale_factor);
   virtual bool SetDeviceColorProfile(const std::vector<char>& color_profile);
   virtual void ResetDeviceColorProfileForTesting();
@@ skipping 283 matching lines @@
 
   scoped_ptr<scheduler::RenderWidgetSchedulingState>
       render_widget_scheduling_state_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_