Move code that doesn't depend on PPAPI out of remoting/client/plugin

remoting/client/plugin/normalizing_input_filter_cros.h

-// Copyright 2014 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 "remoting/protocol/input_filter.h"
-
-#include "remoting/proto/event.pb.h"
-
-namespace remoting {
-
-// NormalizingInputFilterCros addresses the problems generated by key rewritings
-// such as Down->PageDown, 1->F1, etc, when keys are pressed in combination with
-// the OSKey (aka Search). Rewriting OSKey+Down, for example, causes us to
-// receive the following:
-//
-// keydown OSKey
-// keydown PageDown
-// keyup PageDown
-// keyup OSKey
-//
-// The host system will therefore behave as if OSKey+PageDown were pressed,
-// rather than PageDown alone.
-class NormalizingInputFilterCros : public protocol::InputFilter {
- public:
-  explicit NormalizingInputFilterCros(protocol::InputStub* input_stub);
-  ~NormalizingInputFilterCros() override;
-
-  // InputFilter overrides.
-  void InjectKeyEvent(const protocol::KeyEvent& event) override;
-  void InjectMouseEvent(const protocol::MouseEvent& event) override;
-
- private:
-  void ProcessKeyDown(const protocol::KeyEvent& event);
-  void ProcessKeyUp(const protocol::KeyEvent& event);
-
-  void SwitchRewritingKeyToModifying();
-
-  // Holds the keydown event for the most recent OSKey to have been pressed,
-  // while it is Rewriting, or we are not yet sure whether it is Normal,
-  // Rewriting or Modifying. The event is sent on if we switch to Modifying, or
-  // discarded if the OSKey is released while in Rewriting mode.
-  protocol::KeyEvent deferred_keydown_event_;
-
-  // True while the |rewrite_keydown_event_| key is Rewriting, i.e. was followed
-  // by one or more Rewritten key events, and not by any Modified events.
-  bool deferred_key_is_rewriting_;
-
-  // Stores the code of the OSKey while it is pressed for use as a Modifier.
-  uint32 modifying_key_;
-
-  // True if the left Alt key is pressed.
-  bool left_alt_is_pressed_;
-
-  // Previous mouse coordinates.
-  int previous_mouse_x_;
-  int previous_mouse_y_;
-
-  DISALLOW_COPY_AND_ASSIGN(NormalizingInputFilterCros);
-};
-
-}  // namespace remoting