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..9bef73eb437a001f1ed7acc29ec56665b39711fe 100644
--- a/ui/events/ozone/evdev/touch_event_converter_evdev.h
+++ b/ui/events/ozone/evdev/touch_event_converter_evdev.h
@@ -28,6 +28,7 @@ class PointF;
 namespace ui {
 
 class DeviceEventDispatcherEvdev;
+class PalmSuppressionFilter;
 class TouchEvent;
 class TouchNoiseFinder;
 struct InProgressTouchEvdev;
@@ -45,10 +46,12 @@ 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;
   void OnDisabled() override;
+  void SetPalmSuppressionFilter(PalmSuppressionFilter* palm_filter) override;
 
   void DumpTouchEventLog(const char* filename) override;
 
@@ -104,6 +107,9 @@ class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
   // Device has multitouch capability.
   bool has_mt_ = false;
 
+  // Device has pen capability.
+  bool has_pen_ = false;
+
   // Use BTN_LEFT instead of BT_TOUCH.
   bool quirk_left_mouse_button_ = false;
 
@@ -122,6 +128,9 @@ 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 +149,9 @@ class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
   // Records the recent touch events. It is used to fill the feedback reports
   TouchEventLogEvdev touch_evdev_debug_buffer_;
 
+  // Decides whether events should be dropped for palm suppression.
+  PalmSuppressionFilter* palm_filter_;
+
   DISALLOW_COPY_AND_ASSIGN(TouchEventConverterEvdev);
 };