Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

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 <errno.h>
+#include <fcntl.h>
+#include <linux/input.h>
+#include <unistd.h>
+
+#include <vector>
+
+#include "base/bind.h"
+#include "base/command_line.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
+#include "base/posix/eintr_wrapper.h"
+#include "base/run_loop.h"
+#include "base/time/time.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/events/devices/device_data_manager.h"
+#include "ui/events/event_switches.h"
+#include "ui/events/ozone/evdev/device_event_dispatcher_evdev.h"
+#include "ui/events/ozone/evdev/event_device_test_util.h"
+#include "ui/events/ozone/evdev/touch_evdev_types.h"
+#include "ui/events/ozone/evdev/touch_event_converter_evdev.h"
+#include "ui/events/ozone/evdev/touch_noise/touch_noise_filter.h"
+#include "ui/events/ozone/evdev/touch_noise/touch_noise_finder.h"
+#include "ui/events/platform/platform_event_dispatcher.h"
+#include "ui/events/platform/platform_event_source.h"
+
+namespace ui {
+
+namespace {
+
+static int SetNonBlocking(int fd) {
+  int flags = fcntl(fd, F_GETFL, 0);
+  if (flags == -1)
+    flags = 0;
+  return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
+}
+
+const char kTestDevicePath[] = "/dev/input/test-device";
+
+void InitPixelTouchscreen(TouchEventConverterEvdev* device) {
+  EventDeviceInfo devinfo;
+  EXPECT_TRUE(CapabilitiesToDeviceInfo(kLinkTouchscreen, &devinfo));
+  device->Initialize(devinfo);
+}
+
+void InitEloTouchscreen(TouchEventConverterEvdev* device) {
+  EventDeviceInfo devinfo;
+  EXPECT_TRUE(CapabilitiesToDeviceInfo(kElo_TouchSystems_2700, &devinfo));
+  device->Initialize(devinfo);
+}
+
+}  // namespace
+
+class MockTouchEventConverterEvdev : public TouchEventConverterEvdev {
+ public:
+  MockTouchEventConverterEvdev(int fd,
+                               base::FilePath path,
+                               const EventDeviceInfo& devinfo,
+                               DeviceEventDispatcherEvdev* dispatcher);
+  ~MockTouchEventConverterEvdev() override;
+
+  void ConfigureReadMock(struct input_event* queue,
+                         long read_this_many,
+                         long queue_index);
+
+  // Actually dispatch the event reader code.
+  void ReadNow() {
+    OnFileCanReadWithoutBlocking(read_pipe_);
+    base::RunLoop().RunUntilIdle();
+  }
+
+  void SimulateReinitialize(const EventDeviceInfo& devinfo) {
+    Initialize(devinfo);
+  }
+
+  void Reinitialize() override {}
+
+  TouchNoiseFinder* touch_noise_finder() { return touch_noise_finder_.get(); }
+
+ private:
+  int read_pipe_;
+  int write_pipe_;
+
+  DISALLOW_COPY_AND_ASSIGN(MockTouchEventConverterEvdev);
+};
+
+class MockDeviceEventDispatcherEvdev : public DeviceEventDispatcherEvdev {
+ public:
+  MockDeviceEventDispatcherEvdev(
+      const base::Callback<void(const TouchEventParams& params)>& callback)
+      : callback_(callback) {}
+  ~MockDeviceEventDispatcherEvdev() override {}
+
+  // DeviceEventDispatcherEvdev:
+  void DispatchKeyEvent(const KeyEventParams& params) override {}
+  void DispatchMouseMoveEvent(const MouseMoveEventParams& params) override {}
+  void DispatchMouseButtonEvent(const MouseButtonEventParams& params) override {
+  }
+  void DispatchMouseWheelEvent(const MouseWheelEventParams& params) override {}
+  void DispatchScrollEvent(const ScrollEventParams& params) override {}
+  void DispatchTouchEvent(const TouchEventParams& params) override {
+    callback_.Run(params);
+  }
+
+  void DispatchKeyboardDevicesUpdated(
+      const std::vector<KeyboardDevice>& devices) override {}
+  void DispatchTouchscreenDevicesUpdated(
+      const std::vector<TouchscreenDevice>& devices) override {}
+  void DispatchMouseDevicesUpdated(
+      const std::vector<InputDevice>& devices) override {}
+  void DispatchTouchpadDevicesUpdated(
+      const std::vector<InputDevice>& devices) override {}
+  void DispatchDeviceListsComplete() override {}
+
+ private:
+  base::Callback<void(const TouchEventParams& params)> callback_;
+};
+
+MockTouchEventConverterEvdev::MockTouchEventConverterEvdev(
+    int fd,
+    base::FilePath path,
+    const EventDeviceInfo& devinfo,
+    DeviceEventDispatcherEvdev* dispatcher)
+    : TouchEventConverterEvdev(fd,
+                               path,
+                               1,
+                               INPUT_DEVICE_UNKNOWN,
+                               devinfo,
+                               dispatcher) {
+  int fds[2];
+
+  if (pipe(fds))
+    PLOG(FATAL) << "failed pipe";
+
+  EXPECT_FALSE(SetNonBlocking(fds[0]) || SetNonBlocking(fds[1]))
+    << "failed to set non-blocking: " << strerror(errno);
+
+  read_pipe_ = fds[0];
+  write_pipe_ = fds[1];
+
+  events_.resize(ui::kNumTouchEvdevSlots);
+  for (size_t i = 0; i < events_.size(); ++i)
+    events_[i].slot = i;
+
+  SetEnabled(true);
+}
+
+MockTouchEventConverterEvdev::~MockTouchEventConverterEvdev() {
+  SetEnabled(false);
+}
+
+void MockTouchEventConverterEvdev::ConfigureReadMock(struct input_event* queue,
+                                                     long read_this_many,
+                                                     long queue_index) {
+  int nwrite = HANDLE_EINTR(write(write_pipe_,
+                                  queue + queue_index,
+                                  sizeof(struct input_event) * read_this_many));
+  DCHECK(nwrite ==
+         static_cast<int>(sizeof(struct input_event) * read_this_many))
+      << "write() failed, errno: " << errno;
+}
+
+// Test fixture.
+class TouchEventConverterEvdevTest : public testing::Test {
+ public:
+  TouchEventConverterEvdevTest() {}
+
+  // Overridden from testing::Test:
+  void SetUp() override {
+    // Set up pipe to satisfy message pump (unused).
+    int evdev_io[2];
+    if (pipe(evdev_io))
+      PLOG(FATAL) << "failed pipe";
+    events_in_ = evdev_io[0];
+    events_out_ = evdev_io[1];
+
+    // Device creation happens on a worker thread since it may involve blocking
+    // operations. Simulate that by creating it before creating a UI message
+    // loop.
+    EventDeviceInfo devinfo;
+    dispatcher_.reset(new ui::MockDeviceEventDispatcherEvdev(
+        base::Bind(&TouchEventConverterEvdevTest::DispatchCallback,
+                   base::Unretained(this))));
+    device_.reset(new ui::MockTouchEventConverterEvdev(
+        events_in_, base::FilePath(kTestDevicePath), devinfo,
+        dispatcher_.get()));
+    loop_ = new base::MessageLoopForUI;
+
+    ui::DeviceDataManager::CreateInstance();
+  }
+
+  void TearDown() override {
+    device_.reset();
+    delete loop_;
+  }
+
+  ui::MockTouchEventConverterEvdev* device() { return device_.get(); }
+
+  unsigned size() { return dispatched_events_.size(); }
+  const ui::TouchEventParams& dispatched_event(unsigned index) {
+    DCHECK_GT(dispatched_events_.size(), index);
+    return dispatched_events_[index];
+  }
+
+  void ClearDispatchedEvents() { dispatched_events_.clear(); }
+
+  void DestroyDevice() { device_.reset(); }
+
+ private:
+  base::MessageLoop* loop_;
+  scoped_ptr<ui::MockTouchEventConverterEvdev> device_;
+  scoped_ptr<ui::MockDeviceEventDispatcherEvdev> dispatcher_;
+
+  int events_out_;
+  int events_in_;
+
+  void DispatchCallback(const ui::TouchEventParams& params) {
+    dispatched_events_.push_back(params);
+  }
+  std::vector<ui::TouchEventParams> dispatched_events_;
+
+  DISALLOW_COPY_AND_ASSIGN(TouchEventConverterEvdevTest);
+};
+
+TEST_F(TouchEventConverterEvdevTest, NoEvents) {
+  ui::MockTouchEventConverterEvdev* dev = device();
+  dev->ConfigureReadMock(NULL, 0, 0);
+  EXPECT_EQ(0u, size());
+}
+
+TEST_F(TouchEventConverterEvdevTest, TouchMove) {
+  ui::MockTouchEventConverterEvdev* dev = device();
+
+  InitPixelTouchscreen(dev);
+
+  // Captured from Chromebook Pixel (Link).
+  timeval time;
+  time = {1427323282, 19203};
+  struct input_event mock_kernel_queue_press[] = {
+      {time, EV_ABS, ABS_MT_TRACKING_ID, 3},
+      {time, EV_ABS, ABS_MT_POSITION_X, 295},
+      {time, EV_ABS, ABS_MT_POSITION_Y, 421},
+      {time, EV_ABS, ABS_MT_PRESSURE, 34},
+      {time, EV_ABS, ABS_MT_TOUCH_MAJOR, 116},
+      {time, EV_KEY, BTN_TOUCH, 1},
+      {time, EV_ABS, ABS_X, 295},
+      {time, EV_ABS, ABS_Y, 421},
+      {time, EV_ABS, ABS_PRESSURE, 34},
+      {time, EV_SYN, SYN_REPORT, 0},
+  };
+  time = {1427323282, 34693};
+  struct input_event mock_kernel_queue_move[] = {
+      {time, EV_ABS, ABS_MT_POSITION_X, 312},
+      {time, EV_ABS, ABS_MT_POSITION_Y, 432},
+      {time, EV_ABS, ABS_MT_PRESSURE, 43},
+      {time, EV_ABS, ABS_MT_TOUCH_MAJOR, 100},
+      {time, EV_ABS, ABS_X, 312},
+      {time, EV_ABS, ABS_Y, 432},
+      {time, EV_ABS, ABS_PRESSURE, 43},
+      {time, EV_SYN, SYN_REPORT, 0},
+  };
+  time = {1427323282, 144540};
+  struct input_event mock_kernel_queue_release[] = {
+      {time, EV_ABS, ABS_MT_TRACKING_ID, -1},
+      {time, EV_KEY, BTN_TOUCH, 0},
+      {time, EV_ABS, ABS_PRESSURE, 0},
+      {time, EV_SYN, SYN_REPORT, 0},
+  };
+
+  // Press.
+  dev->ConfigureReadMock(mock_kernel_queue_press,
+                         arraysize(mock_kernel_queue_press), 0);
+  dev->ReadNow();
+  EXPECT_EQ(1u, size());
+  ui::TouchEventParams event = dispatched_event(0);
+  EXPECT_EQ(ui::ET_TOUCH_PRESSED, event.type);
+  EXPECT_EQ(base::TimeDelta::FromMicroseconds(1427323282019203),
+            event.timestamp);
+  EXPECT_EQ(295, event.location.x());
+  EXPECT_EQ(421, event.location.y());
+  EXPECT_EQ(0, event.slot);
+  EXPECT_FLOAT_EQ(58.f, event.radii.x());
+  EXPECT_FLOAT_EQ(0.13333334f, event.pressure);
+
+  // Move.
+  dev->ConfigureReadMock(mock_kernel_queue_move,
+                         arraysize(mock_kernel_queue_move), 0);
+  dev->ReadNow();
+  EXPECT_EQ(2u, size());
+  event = dispatched_event(1);
+  EXPECT_EQ(ui::ET_TOUCH_MOVED, event.type);
+  EXPECT_EQ(base::TimeDelta::FromMicroseconds(1427323282034693),
+            event.timestamp);
+  EXPECT_EQ(312, event.location.x());
+  EXPECT_EQ(432, event.location.y());
+  EXPECT_EQ(0, event.slot);
+  EXPECT_FLOAT_EQ(50.f, event.radii.x());
+  EXPECT_FLOAT_EQ(0.16862745f, event.pressure);
+
+  // Release.
+  dev->ConfigureReadMock(mock_kernel_queue_release,
+                         arraysize(mock_kernel_queue_release), 0);
+  dev->ReadNow();
+  EXPECT_EQ(3u, size());
+  event = dispatched_event(2);
+  EXPECT_EQ(ui::ET_TOUCH_RELEASED, event.type);
+  EXPECT_EQ(base::TimeDelta::FromMicroseconds(1427323282144540),
+            event.timestamp);
+  EXPECT_EQ(312, event.location.x());
+  EXPECT_EQ(432, event.location.y());
+  EXPECT_EQ(0, event.slot);
+  EXPECT_FLOAT_EQ(50.f, event.radii.x());
+  EXPECT_FLOAT_EQ(0.16862745f, event.pressure);
+}
+
+TEST_F(TouchEventConverterEvdevTest, TwoFingerGesture) {
+  ui::MockTouchEventConverterEvdev* dev = device();
+
+  InitPixelTouchscreen(dev);
+
+  struct input_event mock_kernel_queue_press0[] = {
+    {{0, 0}, EV_ABS, ABS_MT_TRACKING_ID, 684},
+    {{0, 0}, EV_ABS, ABS_MT_TOUCH_MAJOR, 3},
+    {{0, 0}, EV_ABS, ABS_MT_PRESSURE, 45},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 42},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_Y, 51}, {{0, 0}, EV_SYN, SYN_REPORT, 0}
+  };
+  // Setup and discard a press.
+  dev->ConfigureReadMock(mock_kernel_queue_press0, 6, 0);
+  dev->ReadNow();
+  EXPECT_EQ(1u, size());
+
+  struct input_event mock_kernel_queue_move0[] = {
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 40}, {{0, 0}, EV_SYN, SYN_REPORT, 0}
+  };
+  // Setup and discard a move.
+  dev->ConfigureReadMock(mock_kernel_queue_move0, 2, 0);
+  dev->ReadNow();
+  EXPECT_EQ(2u, size());
+
+  struct input_event mock_kernel_queue_move0press1[] = {
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 40}, {{0, 0}, EV_SYN, SYN_REPORT, 0},
+    {{0, 0}, EV_ABS, ABS_MT_SLOT, 1}, {{0, 0}, EV_ABS, ABS_MT_TRACKING_ID, 686},
+    {{0, 0}, EV_ABS, ABS_MT_TOUCH_MAJOR, 3},
+    {{0, 0}, EV_ABS, ABS_MT_PRESSURE, 45},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 101},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_Y, 102}, {{0, 0}, EV_SYN, SYN_REPORT, 0}
+  };
+  // Move on 0, press on 1.
+  dev->ConfigureReadMock(mock_kernel_queue_move0press1, 9, 0);
+  dev->ReadNow();
+  EXPECT_EQ(4u, size());
+  ui::TouchEventParams ev0 = dispatched_event(2);
+  ui::TouchEventParams ev1 = dispatched_event(3);
+
+  // Move
+  EXPECT_EQ(ui::ET_TOUCH_MOVED, ev0.type);
+  EXPECT_EQ(base::TimeDelta::FromMicroseconds(0), ev0.timestamp);
+  EXPECT_EQ(40, ev0.location.x());
+  EXPECT_EQ(51, ev0.location.y());
+  EXPECT_EQ(0, ev0.slot);
+  EXPECT_FLOAT_EQ(0.17647059f, ev0.pressure);
+
+  // Press
+  EXPECT_EQ(ui::ET_TOUCH_PRESSED, ev1.type);
+  EXPECT_EQ(base::TimeDelta::FromMicroseconds(0), ev1.timestamp);
+  EXPECT_EQ(101, ev1.location.x());
+  EXPECT_EQ(102, ev1.location.y());
+  EXPECT_EQ(1, ev1.slot);
+  EXPECT_FLOAT_EQ(0.17647059f, ev1.pressure);
+
+  // Stationary 0, Moves 1.
+  struct input_event mock_kernel_queue_stationary0_move1[] = {
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 40}, {{0, 0}, EV_SYN, SYN_REPORT, 0}
+  };
+  dev->ConfigureReadMock(mock_kernel_queue_stationary0_move1, 2, 0);
+  dev->ReadNow();
+  EXPECT_EQ(5u, size());
+  ev1 = dispatched_event(4);
+
+  EXPECT_EQ(ui::ET_TOUCH_MOVED, ev1.type);
+  EXPECT_EQ(base::TimeDelta::FromMicroseconds(0), ev1.timestamp);
+  EXPECT_EQ(40, ev1.location.x());
+  EXPECT_EQ(102, ev1.location.y());
+  EXPECT_EQ(1, ev1.slot);
+  EXPECT_FLOAT_EQ(0.17647059f, ev1.pressure);
+
+  // Move 0, stationary 1.
+  struct input_event mock_kernel_queue_move0_stationary1[] = {
+    {{0, 0}, EV_ABS, ABS_MT_SLOT, 0}, {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 39},
+    {{0, 0}, EV_SYN, SYN_REPORT, 0}
+  };
+  dev->ConfigureReadMock(mock_kernel_queue_move0_stationary1, 3, 0);
+  dev->ReadNow();
+  EXPECT_EQ(6u, size());
+  ev0 = dispatched_event(5);
+
+  EXPECT_EQ(ui::ET_TOUCH_MOVED, ev0.type);
+  EXPECT_EQ(base::TimeDelta::FromMicroseconds(0), ev0.timestamp);
+  EXPECT_EQ(39, ev0.location.x());
+  EXPECT_EQ(51, ev0.location.y());
+  EXPECT_EQ(0, ev0.slot);
+  EXPECT_FLOAT_EQ(0.17647059f, ev0.pressure);
+
+  // Release 0, move 1.
+  struct input_event mock_kernel_queue_release0_move1[] = {
+    {{0, 0}, EV_ABS, ABS_MT_TRACKING_ID, -1}, {{0, 0}, EV_ABS, ABS_MT_SLOT, 1},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 38}, {{0, 0}, EV_SYN, SYN_REPORT, 0}
+  };
+  dev->ConfigureReadMock(mock_kernel_queue_release0_move1, 4, 0);
+  dev->ReadNow();
+  EXPECT_EQ(8u, size());
+  ev0 = dispatched_event(6);
+  ev1 = dispatched_event(7);
+
+  EXPECT_EQ(ui::ET_TOUCH_RELEASED, ev0.type);
+  EXPECT_EQ(base::TimeDelta::FromMicroseconds(0), ev0.timestamp);
+  EXPECT_EQ(39, ev0.location.x());
+  EXPECT_EQ(51, ev0.location.y());
+  EXPECT_EQ(0, ev0.slot);
+  EXPECT_FLOAT_EQ(0.17647059f, ev0.pressure);
+
+  EXPECT_EQ(ui::ET_TOUCH_MOVED, ev1.type);
+  EXPECT_EQ(base::TimeDelta::FromMicroseconds(0), ev1.timestamp);
+  EXPECT_EQ(38, ev1.location.x());
+  EXPECT_EQ(102, ev1.location.y());
+  EXPECT_EQ(1, ev1.slot);
+  EXPECT_FLOAT_EQ(0.17647059f, ev1.pressure);
+
+  // Release 1.
+  struct input_event mock_kernel_queue_release1[] = {
+    {{0, 0}, EV_ABS, ABS_MT_TRACKING_ID, -1}, {{0, 0}, EV_SYN, SYN_REPORT, 0},
+  };
+  dev->ConfigureReadMock(mock_kernel_queue_release1, 2, 0);
+  dev->ReadNow();
+  EXPECT_EQ(9u, size());
+  ev1 = dispatched_event(8);
+
+  EXPECT_EQ(ui::ET_TOUCH_RELEASED, ev1.type);
+  EXPECT_EQ(base::TimeDelta::FromMicroseconds(0), ev1.timestamp);
+  EXPECT_EQ(38, ev1.location.x());
+  EXPECT_EQ(102, ev1.location.y());
+  EXPECT_EQ(1, ev1.slot);
+  EXPECT_FLOAT_EQ(0.17647059f, ev1.pressure);
+}
+
+TEST_F(TouchEventConverterEvdevTest, Unsync) {
+  ui::MockTouchEventConverterEvdev* dev = device();
+
+  InitPixelTouchscreen(dev);
+
+  struct input_event mock_kernel_queue_press0[] = {
+    {{0, 0}, EV_ABS, ABS_MT_TRACKING_ID, 684},
+    {{0, 0}, EV_ABS, ABS_MT_TOUCH_MAJOR, 3},
+    {{0, 0}, EV_ABS, ABS_MT_PRESSURE, 45},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 42},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_Y, 51}, {{0, 0}, EV_SYN, SYN_REPORT, 0}
+  };
+
+  dev->ConfigureReadMock(mock_kernel_queue_press0, 6, 0);
+  dev->ReadNow();
+  EXPECT_EQ(1u, size());
+
+  // Prepare a move with a drop.
+  struct input_event mock_kernel_queue_move0[] = {
+    {{0, 0}, EV_SYN, SYN_DROPPED, 0},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 40}, {{0, 0}, EV_SYN, SYN_REPORT, 0}
+  };
+
+  // Verify that we didn't receive it/
+  dev->ConfigureReadMock(mock_kernel_queue_move0, 3, 0);
+  dev->ReadNow();
+  EXPECT_EQ(1u, size());
+
+  struct input_event mock_kernel_queue_move1[] = {
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 40}, {{0, 0}, EV_SYN, SYN_REPORT, 0}
+  };
+
+  // Verify that it re-syncs after a SYN_REPORT.
+  dev->ConfigureReadMock(mock_kernel_queue_move1, 2, 0);
+  dev->ReadNow();
+  EXPECT_EQ(2u, size());
+}
+
+TEST_F(TouchEventConverterEvdevTest, ShouldResumeExistingContactsOnStart) {
+  ui::MockTouchEventConverterEvdev* dev = device();
+
+  EventDeviceInfo devinfo;
+  EXPECT_TRUE(CapabilitiesToDeviceInfo(kLinkTouchscreen, &devinfo));
+
+  // Set up an existing contact in slot 0.
+  devinfo.SetAbsMtSlot(ABS_MT_TRACKING_ID, 0, 1);
+  devinfo.SetAbsMtSlot(ABS_MT_TOUCH_MAJOR, 0, 100);
+  devinfo.SetAbsMtSlot(ABS_MT_POSITION_X, 0, 100);
+  devinfo.SetAbsMtSlot(ABS_MT_POSITION_Y, 0, 100);
+  devinfo.SetAbsMtSlot(ABS_MT_PRESSURE, 0, 128);
+
+  // Initialize the device.
+  dev->Initialize(devinfo);
+
+  // Any report should suffice to dispatch the update.. do an empty one.
+  struct input_event mock_kernel_queue_empty_report[] = {
+      {{0, 0}, EV_SYN, SYN_REPORT, 0},
+  };
+
+  dev->ConfigureReadMock(mock_kernel_queue_empty_report,
+                         arraysize(mock_kernel_queue_empty_report), 0);
+  dev->ReadNow();
+  EXPECT_EQ(1u, size());
+
+  ui::TouchEventParams ev = dispatched_event(0);
+  EXPECT_EQ(ET_TOUCH_PRESSED, ev.type);
+  EXPECT_EQ(0, ev.slot);
+  EXPECT_FLOAT_EQ(50.f, ev.radii.x());
+  EXPECT_FLOAT_EQ(0.f, ev.radii.y());
+  EXPECT_FLOAT_EQ(0.50196081f, ev.pressure);
+}
+
+TEST_F(TouchEventConverterEvdevTest, ShouldReleaseContactsOnStop) {
+  ui::MockTouchEventConverterEvdev* dev = device();
+
+  InitPixelTouchscreen(dev);
+
+  // Captured from Chromebook Pixel (Link).
+  timeval time;
+  time = {1429651083, 686882};
+  struct input_event mock_kernel_queue_press[] = {
+      {time, EV_ABS, ABS_MT_TRACKING_ID, 0},
+      {time, EV_ABS, ABS_MT_POSITION_X, 1003},
+      {time, EV_ABS, ABS_MT_POSITION_Y, 749},
+      {time, EV_ABS, ABS_MT_PRESSURE, 50},
+      {time, EV_ABS, ABS_MT_TOUCH_MAJOR, 116},
+      {time, EV_KEY, BTN_TOUCH, 1},
+      {time, EV_ABS, ABS_X, 1003},
+      {time, EV_ABS, ABS_Y, 749},
+      {time, EV_ABS, ABS_PRESSURE, 50},
+      {time, EV_SYN, SYN_REPORT, 0},
+  };
+
+  dev->ConfigureReadMock(mock_kernel_queue_press,
+                         arraysize(mock_kernel_queue_press), 0);
+  dev->ReadNow();
+  EXPECT_EQ(1u, size());
+
+  ui::TouchEventParams ev1 = dispatched_event(0);
+  EXPECT_EQ(ET_TOUCH_PRESSED, ev1.type);
+  EXPECT_EQ(0, ev1.slot);
+
+  DestroyDevice();
+  EXPECT_EQ(2u, size());
+
+  ui::TouchEventParams ev2 = dispatched_event(1);
+  EXPECT_EQ(ET_TOUCH_RELEASED, 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).
+  timeval time;
+  time = {1429651083, 686882};
+  struct input_event mock_kernel_queue_press[] = {
+      {time, EV_ABS, ABS_MT_TRACKING_ID, 0},
+      {time, EV_ABS, ABS_MT_POSITION_X, 1003},
+      {time, EV_ABS, ABS_MT_POSITION_Y, 749},
+      {time, EV_ABS, ABS_MT_PRESSURE, 50},
+      {time, EV_ABS, ABS_MT_TOUCH_MAJOR, 116},
+      {time, EV_KEY, BTN_TOUCH, 1},
+      {time, EV_ABS, ABS_X, 1003},
+      {time, EV_ABS, ABS_Y, 749},
+      {time, EV_ABS, ABS_PRESSURE, 50},
+      {time, EV_SYN, SYN_REPORT, 0},
+  };
+
+  // Initialize the device.
+  dev->Initialize(devinfo);
+
+  dev->ConfigureReadMock(mock_kernel_queue_press,
+                         arraysize(mock_kernel_queue_press), 0);
+  dev->ReadNow();
+  EXPECT_EQ(1u, size());
+
+  ui::TouchEventParams ev1 = dispatched_event(0);
+  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_event(1);
+  EXPECT_EQ(ET_TOUCH_RELEASED, 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).
+  dev->SimulateReinitialize(devinfo);
+  dev->SetEnabled(true);
+  EXPECT_EQ(3u, size());
+
+  ui::TouchEventParams ev3 = dispatched_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());
+}
+
+// crbug.com/477695
+TEST_F(TouchEventConverterEvdevTest, ShouldUseLeftButtonIfNoTouchButton) {
+  ui::MockTouchEventConverterEvdev* dev = device();
+
+  InitEloTouchscreen(dev);
+
+  // Captured from Elo TouchSystems 2700.
+  timeval time;
+  time = {1433965490, 837958};
+  struct input_event mock_kernel_queue_press[] = {
+      {time, EV_ABS, ABS_X, 3654},
+      {time, EV_ABS, ABS_Y, 1054},
+      {time, EV_ABS, ABS_MISC, 18},
+      {time, EV_SYN, SYN_REPORT, 0},
+
+      {time, EV_MSC, MSC_SCAN, 90001},
+      {time, EV_KEY, BTN_LEFT, 1},
+      {time, EV_ABS, ABS_Y, 1055},
+      {time, EV_ABS, ABS_MISC, 25},
+      {time, EV_SYN, SYN_REPORT, 0},
+  };
+  time = {1433965491, 1953};
+  struct input_event mock_kernel_queue_move[] = {
+      {time, EV_ABS, ABS_X, 3644},
+      {time, EV_ABS, ABS_Y, 1059},
+      {time, EV_ABS, ABS_MISC, 36},
+      {time, EV_SYN, SYN_REPORT, 0},
+  };
+  time = {1433965491, 225959};
+  struct input_event mock_kernel_queue_release[] = {
+      {time, EV_MSC, MSC_SCAN, 90001},
+      {time, EV_KEY, BTN_LEFT, 0},
+      {time, EV_ABS, ABS_MISC, 0},
+      {time, EV_SYN, SYN_REPORT, 0},
+  };
+
+  // Press.
+  dev->ConfigureReadMock(mock_kernel_queue_press,
+                         arraysize(mock_kernel_queue_press), 0);
+  dev->ReadNow();
+  EXPECT_EQ(1u, size());
+  ui::TouchEventParams event = dispatched_event(0);
+  EXPECT_EQ(ui::ET_TOUCH_PRESSED, event.type);
+  EXPECT_EQ(base::TimeDelta::FromMicroseconds(1433965490837958),
+            event.timestamp);
+  EXPECT_EQ(3654, event.location.x());
+  EXPECT_EQ(1055, event.location.y());
+  EXPECT_EQ(0, event.slot);
+  EXPECT_FLOAT_EQ(0.f, event.radii.x());
+  EXPECT_FLOAT_EQ(0.f, event.pressure);
+
+  // Move.
+  dev->ConfigureReadMock(mock_kernel_queue_move,
+                         arraysize(mock_kernel_queue_move), 0);
+  dev->ReadNow();
+  EXPECT_EQ(2u, size());
+  event = dispatched_event(1);
+  EXPECT_EQ(ui::ET_TOUCH_MOVED, event.type);
+  EXPECT_EQ(base::TimeDelta::FromMicroseconds(1433965491001953),
+            event.timestamp);
+  EXPECT_EQ(3644, event.location.x());
+  EXPECT_EQ(1059, event.location.y());
+  EXPECT_EQ(0, event.slot);
+  EXPECT_FLOAT_EQ(0.f, event.radii.x());
+  EXPECT_FLOAT_EQ(0.f, event.pressure);
+
+  // Release.
+  dev->ConfigureReadMock(mock_kernel_queue_release,
+                         arraysize(mock_kernel_queue_release), 0);
+  dev->ReadNow();
+  EXPECT_EQ(3u, size());
+  event = dispatched_event(2);
+  EXPECT_EQ(ui::ET_TOUCH_RELEASED, event.type);
+  EXPECT_EQ(base::TimeDelta::FromMicroseconds(1433965491225959),
+            event.timestamp);
+  EXPECT_EQ(3644, event.location.x());
+  EXPECT_EQ(1059, event.location.y());
+  EXPECT_EQ(0, event.slot);
+  EXPECT_FLOAT_EQ(0.f, event.radii.x());
+  EXPECT_FLOAT_EQ(0.f, event.pressure);
+
+  // No dispatch on destruction.
+  DestroyDevice();
+  EXPECT_EQ(3u, size());
+}
+
+// crbug.com/407386
+TEST_F(TouchEventConverterEvdevTest,
+       DontChangeMultitouchPositionFromLegacyAxes) {
+  ui::MockTouchEventConverterEvdev* dev = device();
+
+  InitPixelTouchscreen(dev);
+
+  struct input_event mock_kernel_queue[] = {
+      {{0, 0}, EV_ABS, ABS_MT_SLOT, 0},
+      {{0, 0}, EV_ABS, ABS_MT_TRACKING_ID, 100},
+      {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 999},
+      {{0, 0}, EV_ABS, ABS_MT_POSITION_Y, 888},
+      {{0, 0}, EV_ABS, ABS_MT_PRESSURE, 55},
+      {{0, 0}, EV_ABS, ABS_MT_SLOT, 1},
+      {{0, 0}, EV_ABS, ABS_MT_TRACKING_ID, 200},
+      {{0, 0}, EV_ABS, ABS_MT_PRESSURE, 44},
+      {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 777},
+      {{0, 0}, EV_ABS, ABS_MT_POSITION_Y, 666},
+      {{0, 0}, EV_ABS, ABS_X, 999},
+      {{0, 0}, EV_ABS, ABS_Y, 888},
+      {{0, 0}, EV_ABS, ABS_PRESSURE, 55},
+      {{0, 0}, EV_SYN, SYN_REPORT, 0},
+  };
+
+  // Check that two events are generated.
+  dev->ConfigureReadMock(mock_kernel_queue, arraysize(mock_kernel_queue), 0);
+  dev->ReadNow();
+
+  const unsigned int kExpectedEventCount = 2;
+  EXPECT_EQ(kExpectedEventCount, size());
+  if (kExpectedEventCount != size())
+    return;
+
+  ui::TouchEventParams ev0 = dispatched_event(0);
+  ui::TouchEventParams ev1 = dispatched_event(1);
+
+  EXPECT_EQ(0, ev0.slot);
+  EXPECT_EQ(999, ev0.location.x());
+  EXPECT_EQ(888, ev0.location.y());
+  EXPECT_FLOAT_EQ(0.21568628f, ev0.pressure);
+
+  EXPECT_EQ(1, ev1.slot);
+  EXPECT_EQ(777, ev1.location.x());
+  EXPECT_EQ(666, ev1.location.y());
+  EXPECT_FLOAT_EQ(0.17254902f, ev1.pressure);
+}
+
+// crbug.com/446939
+TEST_F(TouchEventConverterEvdevTest, CheckSlotLimit) {
+  ui::MockTouchEventConverterEvdev* dev = device();
+
+  struct input_event mock_kernel_queue[] = {
+      {{0, 0}, EV_ABS, ABS_MT_SLOT, 0},
+      {{0, 0}, EV_ABS, ABS_MT_TRACKING_ID, 100},
+      {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 999},
+      {{0, 0}, EV_ABS, ABS_MT_POSITION_Y, 888},
+      {{0, 0}, EV_ABS, ABS_MT_SLOT, ui::kNumTouchEvdevSlots},
+      {{0, 0}, EV_ABS, ABS_MT_TRACKING_ID, 200},
+      {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 777},
+      {{0, 0}, EV_ABS, ABS_MT_POSITION_Y, 666},
+      {{0, 0}, EV_SYN, SYN_REPORT, 0},
+  };
+
+  // Check that one 1 event is generated
+  dev->ConfigureReadMock(mock_kernel_queue, arraysize(mock_kernel_queue), 0);
+  dev->ReadNow();
+  EXPECT_EQ(1u, size());
+}
+
+namespace {
+
+// TouchNoiseFilter which:
+// - Considers all events of type |noise_event_type| as noise.
+// - Keeps track of the events that it receives.
+class EventTypeTouchNoiseFilter : public TouchNoiseFilter {
+ public:
+  explicit EventTypeTouchNoiseFilter(EventType noise_event_type)
+      : noise_event_type_(noise_event_type) {}
+  ~EventTypeTouchNoiseFilter() override {}
+
+  // TouchNoiseFilter:
+  void Filter(const std::vector<InProgressTouchEvdev>& touches,
+              base::TimeDelta time,
+              std::bitset<kNumTouchEvdevSlots>* slots_with_noise) override {
+    for (const InProgressTouchEvdev& touch : touches) {
+      EventType event_type = EventTypeFromTouch(touch);
+      ++counts_[event_type];
+      if (event_type == noise_event_type_)
+        slots_with_noise->set(touch.slot);
+    }
+  }
+
+  // Returns the number of received events of |type|.
+  size_t num_events(EventType type) const {
+    std::map<EventType, size_t>::const_iterator it = counts_.find(type);
+    return it == counts_.end() ? 0u : it->second;
+  }
+
+ private:
+  EventType EventTypeFromTouch(const InProgressTouchEvdev& touch) const {
+    if (touch.touching)
+      return touch.was_touching ? ET_TOUCH_MOVED : ET_TOUCH_PRESSED;
+    return touch.was_touching ? ET_TOUCH_RELEASED : ET_UNKNOWN;
+  }
+
+  EventType noise_event_type_;
+  std::map<EventType, size_t> counts_;
+
+  DISALLOW_COPY_AND_ASSIGN(EventTypeTouchNoiseFilter);
+};
+
+}  // namespace
+
+class TouchEventConverterEvdevTouchNoiseTest
+    : public TouchEventConverterEvdevTest {
+ public:
+  TouchEventConverterEvdevTouchNoiseTest() {}
+  ~TouchEventConverterEvdevTouchNoiseTest() override {}
+
+  // Makes the TouchNoiseFinder use |filter| and only |filter| to filter out
+  // touch noise.
+  void SetTouchNoiseFilter(scoped_ptr<TouchNoiseFilter> filter) {
+    TouchNoiseFinder* finder = device()->touch_noise_finder();
+    finder->filters_.clear();
+    finder->filters_.push_back(filter.release());
+  }
+
+  // Returns the first of TouchNoiseFinder's filters.
+  ui::TouchNoiseFilter* first_filter() {
+    TouchNoiseFinder* finder = device()->touch_noise_finder();
+    return finder->filters_.empty() ? nullptr : *finder->filters_.begin();
+  }
+
+  // TouchEventConverterEvdevTest:
+  void SetUp() override {
+    base::CommandLine::ForCurrentProcess()->AppendSwitch(
+        switches::kExtraTouchNoiseFiltering);
+    TouchEventConverterEvdevTest::SetUp();
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TouchEventConverterEvdevTouchNoiseTest);
+};
+
+// Test that if TouchNoiseFinder identifies an event for an in-progress touch as
+// noise, that the event is converted to ET_TOUCH_CANCELLED and that all
+// subsequent events for the in-progress touch are cancelled.
+TEST_F(TouchEventConverterEvdevTouchNoiseTest, TouchNoiseFiltering) {
+  struct input_event mock_kernel_queue[] = {
+    {{0, 0}, EV_ABS, ABS_MT_TRACKING_ID, 684},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 40},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_Y, 41},
+    {{0, 0}, EV_SYN, SYN_REPORT, 0},
+
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 42},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_Y, 43},
+    {{0, 0}, EV_SYN, SYN_REPORT, 0},
+
+    {{0, 0}, EV_ABS, ABS_MT_TRACKING_ID, -1},
+    {{0, 0}, EV_SYN, SYN_REPORT, 0}
+  };
+
+  MockTouchEventConverterEvdev* dev = device();
+  SetTouchNoiseFilter(scoped_ptr<TouchNoiseFilter>(
+      new EventTypeTouchNoiseFilter(ET_TOUCH_PRESSED)));
+  dev->ConfigureReadMock(mock_kernel_queue, arraysize(mock_kernel_queue), 0);
+  dev->ReadNow();
+  ASSERT_EQ(0u, size());
+
+  ClearDispatchedEvents();
+  SetTouchNoiseFilter(scoped_ptr<TouchNoiseFilter>(
+      new EventTypeTouchNoiseFilter(ET_TOUCH_MOVED)));
+  dev->ConfigureReadMock(mock_kernel_queue, arraysize(mock_kernel_queue), 0);
+  dev->ReadNow();
+  ASSERT_EQ(2u, size());
+  TouchEventParams event0 = dispatched_event(0);
+  EXPECT_EQ(ET_TOUCH_PRESSED, event0.type);
+  EXPECT_EQ(40, event0.location.x());
+  EXPECT_EQ(41, event0.location.y());
+  EXPECT_EQ(ET_TOUCH_CANCELLED, dispatched_event(1).type);
+
+  ClearDispatchedEvents();
+  SetTouchNoiseFilter(scoped_ptr<TouchNoiseFilter>(
+      new EventTypeTouchNoiseFilter(ET_TOUCH_RELEASED)));
+  dev->ConfigureReadMock(mock_kernel_queue, arraysize(mock_kernel_queue), 0);
+  dev->ReadNow();
+  ASSERT_EQ(3u, size());
+  event0 = dispatched_event(0);
+  EXPECT_EQ(ET_TOUCH_PRESSED, event0.type);
+  EXPECT_EQ(40, event0.location.x());
+  EXPECT_EQ(41, event0.location.y());
+  TouchEventParams event1 = dispatched_event(1);
+  EXPECT_EQ(ET_TOUCH_MOVED, event1.type);
+  EXPECT_EQ(42, event1.location.x());
+  EXPECT_EQ(43, event1.location.y());
+  EXPECT_EQ(ET_TOUCH_CANCELLED, dispatched_event(2).type);
+}
+
+// Test that TouchEventConverterEvdev keeps sending events to
+// TouchNoiseFinder after the touch is canceled.
+TEST_F(TouchEventConverterEvdevTouchNoiseTest,
+       DoNotSendTouchCancelsToTouchNoiseFinder) {
+  struct input_event mock_kernel_queue[] = {
+    {{0, 0}, EV_ABS, ABS_MT_TRACKING_ID, 684},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 40},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_Y, 41},
+    {{0, 0}, EV_SYN, SYN_REPORT, 0},
+
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 42},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_Y, 43},
+    {{0, 0}, EV_SYN, SYN_REPORT, 0},
+
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_X, 43},
+    {{0, 0}, EV_ABS, ABS_MT_POSITION_Y, 44},
+    {{0, 0}, EV_SYN, SYN_REPORT, 0},
+
+    {{0, 0}, EV_ABS, ABS_MT_TRACKING_ID, -1},
+    {{0, 0}, EV_SYN, SYN_REPORT, 0}
+  };
+
+  MockTouchEventConverterEvdev* dev = device();
+  SetTouchNoiseFilter(scoped_ptr<TouchNoiseFilter>(
+      new EventTypeTouchNoiseFilter(ET_TOUCH_PRESSED)));
+  dev->ConfigureReadMock(mock_kernel_queue, arraysize(mock_kernel_queue), 0);
+  dev->ReadNow();
+  ASSERT_EQ(0u, size());
+
+  EventTypeTouchNoiseFilter* filter =
+      static_cast<EventTypeTouchNoiseFilter*>(first_filter());
+  EXPECT_EQ(1u, filter->num_events(ET_TOUCH_PRESSED));
+  EXPECT_EQ(2u, filter->num_events(ET_TOUCH_MOVED));
+  EXPECT_EQ(1u, filter->num_events(ET_TOUCH_RELEASED));
+}
+
+}  // namespace ui