Add palm suppression feature to EventConverterEvdev

ui/events/ozone/evdev/touch_event_converter_evdev_unittest.cc

 // 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 "ui/events/ozone/evdev/touch_event_converter_evdev.h"
 
 #include <errno.h>
 #include <linux/input.h>
 #include <stddef.h>
 #include <unistd.h>
@@ skipping 591 matching lines @@
   EXPECT_EQ(1u, size());
 
   ui::TouchEventParams ev1 = dispatched_touch_event(0);
   EXPECT_EQ(ET_TOUCH_PRESSED, ev1.type);
   EXPECT_EQ(0, ev1.slot);
 
   DestroyDevice();
   EXPECT_EQ(2u, size());
 
   ui::TouchEventParams ev2 = dispatched_touch_event(1);
-  EXPECT_EQ(ET_TOUCH_RELEASED, ev2.type);
+  EXPECT_EQ(ET_TOUCH_CANCELLED, ev2.type);
   EXPECT_EQ(0, ev2.slot);
 }
 
 TEST_F(TouchEventConverterEvdevTest, ShouldRemoveContactsWhenDisabled) {
   ui::MockTouchEventConverterEvdev* dev = device();
 
   EventDeviceInfo devinfo;
   EXPECT_TRUE(CapabilitiesToDeviceInfo(kLinkTouchscreen, &devinfo));
 
   // Captured from Chromebook Pixel (Link).
@@ skipping 24 matching lines @@
   EXPECT_EQ(ET_TOUCH_PRESSED, ev1.type);
   EXPECT_EQ(0, ev1.slot);
   EXPECT_EQ(1003, ev1.location.x());
   EXPECT_EQ(749, ev1.location.y());
 
   // Disable the device (should release the contact).
   dev->SetEnabled(false);
   EXPECT_EQ(2u, size());
 
   ui::TouchEventParams ev2 = dispatched_touch_event(1);
-  EXPECT_EQ(ET_TOUCH_RELEASED, ev2.type);
+  EXPECT_EQ(ET_TOUCH_CANCELLED, ev2.type);
   EXPECT_EQ(0, ev2.slot);
 
   // Set up the previous contact in slot 0.
   devinfo.SetAbsMtSlot(ABS_MT_TRACKING_ID, 0, 0);
   devinfo.SetAbsMtSlot(ABS_MT_TOUCH_MAJOR, 0, 116);
   devinfo.SetAbsMtSlot(ABS_MT_POSITION_X, 0, 1003);
   devinfo.SetAbsMtSlot(ABS_MT_POSITION_Y, 0, 749);
   devinfo.SetAbsMtSlot(ABS_MT_PRESSURE, 0, 50);
 
-  // Re-enable the device (should re-apply the contact).
+  // Re-enable the device (touch is cancelled, should not come back)
   dev->SimulateReinitialize(devinfo);
   dev->SetEnabled(true);
-  EXPECT_EQ(3u, size());
+  EXPECT_EQ(2u, size());
 
-  ui::TouchEventParams ev3 = dispatched_touch_event(2);
-  EXPECT_EQ(ET_TOUCH_PRESSED, ev3.type);
-  EXPECT_EQ(0, ev3.slot);
-  EXPECT_EQ(1003, ev3.location.x());
-  EXPECT_EQ(749, ev3.location.y());
+  // Send updates to touch (touch is cancelled, should not come back)
+  dev->ConfigureReadMock(mock_kernel_queue_press,
+                         arraysize(mock_kernel_queue_press), 0);
+  dev->ReadNow();
+  EXPECT_EQ(2u, size());
 }
 
 // crbug.com/477695
 TEST_F(TouchEventConverterEvdevTest, ShouldUseLeftButtonIfNoTouchButton) {
   ui::MockTouchEventConverterEvdev* dev = device();
 
   InitEloTouchscreen(dev);
 
   // Captured from Elo TouchSystems 2700.
   timeval time;
@@ skipping 453 matching lines @@
 
   event = dispatched_mouse_move_event(6);
   EXPECT_EQ(8930, event.location.x());
   EXPECT_EQ(980, event.location.y());
   EXPECT_EQ(EventPointerType::POINTER_TYPE_PEN,
             event.pointer_details.pointer_type);
   EXPECT_EQ(0.f / 1024, event.pointer_details.force);
 }
 
 }  // namespace ui