Port Chromium OS touch noise filtering to Chromium

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 f522921da46912af1c748c8d0a72f1ceb009ac80..eb847dc07a5f55c11e4d5d512d0e76df3b85c54e 100644
--- a/ui/events/ozone/evdev/touch_event_converter_evdev.h
+++ b/ui/events/ozone/evdev/touch_event_converter_evdev.h
@@ -9,6 +9,7 @@
 
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_pump_libevent.h"
 #include "ui/events/event_constants.h"
 #include "ui/events/ozone/evdev/event_converter_evdev.h"
@@ -17,14 +18,14 @@
 
 namespace ui {
 
-class TouchEvent;
-
 class DeviceEventDispatcherEvdev;
+class TouchEvent;
+class TouchNoiseFinder;
+struct InProgressTouchEvdev;
 
 class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
     : public EventConverterEvdev {
  public:
-  enum { MAX_FINGERS = 20 };
   TouchEventConverterEvdev(int fd,
                            base::FilePath path,
                            int id,
@@ -43,21 +44,6 @@ class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
  private:
   friend class MockTouchEventConverterEvdev;
 
-  struct InProgressEvents {
-    InProgressEvents();
-
-    bool altered_;
-    float x_;
-    float y_;
-    int id_;  // Device reported "unique" touch point id; -1 means not active
-    int finger_;  // "Finger" id starting from 0; -1 means not active
-
-    EventType type_;
-    float radius_x_;
-    float radius_y_;
-    float pressure_;
-  };
-
   // Overidden from base::MessagePumpLibevent::Watcher.
   void OnFileCanReadWithoutBlocking(int fd) override;
 
@@ -67,8 +53,13 @@ class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
   void ProcessAbs(const input_event& input);
   void ProcessSyn(const input_event& input);
 
-  void ReportEvent(int touch_id,
-      const InProgressEvents& event, const base::TimeDelta& delta);
+  // Returns an EventType to dispatch for |touch|. Returns ET_UNKNOWN if an
+  // event should not be dispatched.
+  EventType GetEventTypeForTouch(const InProgressTouchEvdev& touch);
+
+  void ReportEvent(const InProgressTouchEvdev& event,
+                   EventType event_type,
+                   const base::TimeDelta& delta);
   void ReportEvents(base::TimeDelta delta);
 
   // Dispatcher for events.
@@ -77,9 +68,6 @@ class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
   // Set if we have seen a SYN_DROPPED and not yet re-synced with the device.
   bool syn_dropped_;
 
-  // Set if this is a type A device (uses SYN_MT_REPORT).
-  bool is_type_a_;
-
   // Pressure values.
   int pressure_min_;
   int pressure_max_;  // Used to normalize pressure values.
@@ -102,7 +90,10 @@ class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
   size_t current_slot_;
 
   // In-progress touch points.
-  std::vector<InProgressEvents> events_;
+  std::vector<InProgressTouchEvdev> events_;
+
+  // Finds touch noise.
+  scoped_ptr<TouchNoiseFinder> touch_noise_finder_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchEventConverterEvdev);
 };