Add palm suppression feature to EventConverterEvdev

ui/events/ozone/evdev/touch_event_converter_evdev.h

Index: ui/events/ozone/evdev/touch_event_converter_evdev.h
diff --git a/ui/events/ozone/evdev/touch_event_converter_evdev.h b/ui/events/ozone/evdev/touch_event_converter_evdev.h
index ccb60d7c1331b13939b3300e0887498da2a365d8..1083649602e98e0e96c8a828bee520399277f73e 100644
--- a/ui/events/ozone/evdev/touch_event_converter_evdev.h
+++ b/ui/events/ozone/evdev/touch_event_converter_evdev.h
@@ -45,6 +45,7 @@ class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
 
   // EventConverterEvdev:
   bool HasTouchscreen() const override;
+  bool HasPen() const override;
   gfx::Size GetTouchscreenSize() const override;
   int GetTouchPoints() const override;
   void OnEnabled() override;
@@ -55,6 +56,10 @@ class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
   // Update touch event logging state
   void SetTouchEventLoggingEnabled(bool enabled) override;
 
+  // Sets callback to enable/disable palm suppression.
+  void SetPalmSuppressionCallback(
+      const base::Callback<void(bool)>& callback) override;
+
   // Unsafe part of initialization.
   virtual void Initialize(const EventDeviceInfo& info);
 
@@ -104,6 +109,9 @@ class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
   // Device has multitouch capability.
   bool has_mt_ = false;
 
+  // Device supports pen input.
+  bool has_pen_ = false;
+
   // Use BTN_LEFT instead of BT_TOUCH.
   bool quirk_left_mouse_button_ = false;
 
@@ -122,6 +130,9 @@ class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
   // Number of touch points reported by driver
   int touch_points_ = 0;
 
+  // Maximum value of touch major axis
+  int major_max_ = 0;
+
   // Tracking id counter.
   int next_tracking_id_ = 0;
 
@@ -140,6 +151,9 @@ class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
   // Records the recent touch events. It is used to fill the feedback reports
   TouchEventLogEvdev touch_evdev_debug_buffer_;
 
+  // Callback to enable/disable palm suppression.
+  base::Callback<void(bool)> enable_palm_suppression_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(TouchEventConverterEvdev);
 };