ozone: Handle on-screen stylus support consistently

ui/events/ozone/evdev/tablet_event_converter_evdev.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.
 
 #ifndef UI_EVENTS_OZONE_TABLET_EVENT_CONVERTER_EVDEV_H_
 #define UI_EVENTS_OZONE_TABLET_EVENT_CONVERTER_EVDEV_H_
 
 #include "base/files/file_path.h"
 #include "base/message_loop/message_pump_libevent.h"
 #include "ui/events/event.h"
@@ skipping 23 matching lines @@
   // EventConverterEvdev:
   void OnFileCanReadWithoutBlocking(int fd) override;
 
   void ProcessEvents(const struct input_event* inputs, int count);
 
  private:
   friend class MockTabletEventConverterEvdev;
   void ConvertKeyEvent(const input_event& input);
   void ConvertAbsEvent(const input_event& input);
   void DispatchMouseButton(const input_event& input);
+  void DispatchTouch(const input_event& input);
   void UpdateCursor();
 
   // Flush events delimited by EV_SYN. This is useful for handling
   // non-axis-aligned movement properly.
-  void FlushEvents();
+  void FlushEvents(const input_event& input);
 
   // Controller for watching the input fd.
   base::MessagePumpLibevent::FileDescriptorWatcher controller_;
 
   // Shared cursor state.
   CursorDelegateEvdev* cursor_;
 
   // Modifier key state (shift, ctrl, etc).
   EventModifiersEvdev* modifiers_;
 
   // Callback for dispatching events.
   EventDispatchCallback callback_;
 
   int y_abs_location_;
   int x_abs_location_;
+  int pressure_;
   int x_abs_min_;
   int y_abs_min_;
+  int pressure_min_;
   int x_abs_range_;
   int y_abs_range_;
+  int pressure_range_;
 
   // BTN_TOOL_ code for the active device
   int stylus_;
 
   // Whether we need to move the cursor
   bool abs_value_dirty_;
 
+  // For on-screen active stylus generate touch events
+  bool on_screen_stylus_;
+
+  // Emit touch events for motion vs mouse
+  bool emit_touch_;
+
   DISALLOW_COPY_AND_ASSIGN(TabletEventConverterEvdev);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_OZONE_TABLET_EVENT_CONVERTER_EVDEV_H_