Move ClientSession's input logic into separate components.

remoting/client/plugin/pepper_input_handler.h

 // Copyright (c) 2011 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 REMOTING_CLIENT_PLUGIN_PEPPER_INPUT_HANDLER_H_
 #define REMOTING_CLIENT_PLUGIN_PEPPER_INPUT_HANDLER_H_
 
 #include "base/compiler_specific.h"
 #include "remoting/protocol/input_stub.h"
 
 namespace pp {
 class InputEvent;
 }  // namespace pp
 
 namespace remoting {
 
 namespace protocol {
 class InputStub;
 } // namespace protocol
 
 class PepperInputHandler {
  public:
-  PepperInputHandler(protocol::InputStub* input_stub);
+  explicit PepperInputHandler(protocol::InputStub* input_stub);
   virtual ~PepperInputHandler();
 
   bool HandleInputEvent(const pp::InputEvent& event);
 
  private:
   protocol::InputStub* input_stub_;
 
   float wheel_ticks_x_;
   float wheel_ticks_y_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperInputHandler);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_PLUGIN_PEPPER_INPUT_HANDLER_H_