Port of Android platform gesture detection code to C++

ui/events/gesture_detection/gesture_provider_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 "base/basictypes.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/time/time.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/events/gesture_detection/gesture_event_params.h"
+#include "ui/events/gesture_detection/gesture_provider.h"
+#include "ui/events/gesture_detection/mock_motion_event.h"
+#include "ui/events/gesture_detection/motion_event.h"
+#include "ui/gfx/geometry/point_f.h"
+
+using base::TimeDelta;
+using base::TimeTicks;
+
+namespace ui {
+namespace {
+
+const float kFakeCoordX = 42.f;
+const float kFakeCoordY = 24.f;
+const TimeDelta kOneSecond = TimeDelta::FromSeconds(1);
+const TimeDelta kFiveMilliseconds = TimeDelta::FromMilliseconds(5);
+
+}  // namespace
+
+class GestureProviderTest : public testing::Test, public GestureProviderClient {
+ public:
+  GestureProviderTest() {}
+  virtual ~GestureProviderTest() {}
+
+  static MockMotionEvent ObtainMotionEvent(base::TimeTicks event_time,
+                                           MotionEvent::Action action,
+                                           float x,
+                                           float y) {
+    return MockMotionEvent(action, event_time, x, y);
+  }
+
+  static MockMotionEvent ObtainMotionEvent(base::TimeTicks event_time,
+                                           MotionEvent::Action action,
+                                           float x0,
+                                           float y0,
+                                           float x1,
+                                           float y1) {
+    return MockMotionEvent(action, event_time, x0, y0, x1, y1);
+  }
+
+  static MockMotionEvent ObtainMotionEvent(base::TimeTicks event_time,
+                                           MotionEvent::Action action) {
+    return ObtainMotionEvent(event_time, action, kFakeCoordX, kFakeCoordY);
+  }
+
+  // Test
+  virtual void SetUp() OVERRIDE {
+    gesture_provider_.reset(new GestureProvider(GetDefaultConfig(), this));
+    gesture_provider_->UpdateMultiTouchSupport(false);
+  }
+
+  virtual void TearDown() OVERRIDE {
+    gestures_.clear();
+    gesture_provider_.reset();
+  }
+
+  // GestureProviderClient
+  virtual void OnGestureEvent(const GestureEventParams& gesture) OVERRIDE {
+    if (gesture.type == GESTURE_SCROLL_BEGIN)
+      active_scroll_begin_event_.reset(new GestureEventParams(gesture));
+    gestures_.push_back(gesture);
+  }
+
+  bool HasReceivedGesture(GestureEventType type) const {
+    for (size_t i = 0; i < gestures_.size(); ++i) {
+      if (gestures_[i].type == type)
+        return true;
+    }
+    return false;
+  }
+
+  const GestureEventParams& GetMostRecentGestureEvent() const {
+    EXPECT_FALSE(gestures_.empty());
+    return gestures_.back();
+  }
+
+  const GestureEventType GetMostRecentGestureEventType() const {
+    EXPECT_FALSE(gestures_.empty());
+    return gestures_.back().type;
+  }
+
+  size_t GetReceivedGestureCount() const { return gestures_.size(); }
+
+  const GestureEventParams& GetReceivedGesture(size_t index) const {
+    EXPECT_LT(index, GetReceivedGestureCount());
+    return gestures_[index];
+  }
+
+  const GestureEventParams* GetActiveScrollBeginEvent() const {
+    return active_scroll_begin_event_ ? active_scroll_begin_event_.get() : NULL;
+  }
+
+  const GestureProvider::Config& GetDefaultConfig() const {
+    static GestureProvider::Config sConfig;
+    return sConfig;
+  }
+
+  int GetTouchSlop() const {
+    return GetDefaultConfig().gesture_detector_config.scaled_touch_slop;
+  }
+
+  base::TimeDelta GetLongPressTimeout() const {
+    return GetDefaultConfig().gesture_detector_config.longpress_timeout;
+  }
+
+  base::TimeDelta GetShowPressTimeout() const {
+    return GetDefaultConfig().gesture_detector_config.tap_timeout;
+  }
+
+ protected:
+  void CheckScrollEventSequenceForEndActionType(
+      MotionEvent::Action end_action_type) {
+    base::TimeTicks event_time = base::TimeTicks::Now();
+    const int scroll_to_x = kFakeCoordX + 100;
+    const int scroll_to_y = kFakeCoordY + 100;
+
+    MockMotionEvent event =
+        ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+
+    EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+    event = ObtainMotionEvent(event_time + kOneSecond,
+                              MotionEvent::ACTION_MOVE,
+                              scroll_to_x,
+                              scroll_to_y);
+    EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+    EXPECT_TRUE(gesture_provider_->IsScrollInProgress());
+    EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_BEGIN));
+    EXPECT_EQ(GESTURE_SCROLL_UPDATE, GetMostRecentGestureEventType());
+    ASSERT_EQ(4U, GetReceivedGestureCount()) << "Only TapDown, TapCancel, "
+                                                "ScrollBegin and ScrollBy "
+                                                "should have been sent";
+
+    EXPECT_EQ(GESTURE_TAP_CANCEL, GetReceivedGesture(1).type);
+    EXPECT_EQ(GESTURE_SCROLL_BEGIN, GetReceivedGesture(2).type);
+    EXPECT_EQ(event_time + kOneSecond, GetReceivedGesture(2).time)
+        << "ScrollBegin should have the time of the ACTION_MOVE";
+
+    event = ObtainMotionEvent(
+        event_time + kOneSecond, end_action_type, scroll_to_x, scroll_to_y);
+    gesture_provider_->OnTouchEvent(event);
+    EXPECT_FALSE(gesture_provider_->IsScrollInProgress());
+    EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_END));
+    EXPECT_EQ(GESTURE_SCROLL_END, GetMostRecentGestureEventType());
+  }
+
+  static void Wait(base::TimeDelta delay) {
+    base::MessageLoop::current()->PostDelayedTask(
+        FROM_HERE, base::MessageLoop::QuitClosure(), delay);
+    base::MessageLoop::current()->Run();
+  }
+
+  std::vector<GestureEventParams> gestures_;
+  scoped_ptr<GestureProvider> gesture_provider_;
+  scoped_ptr<GestureEventParams> active_scroll_begin_event_;
+  base::MessageLoopForUI message_loop_;
+};
+
+// Verify that a DOWN followed shortly by an UP will trigger a single tap.
+TEST_F(GestureProviderTest, GestureSingleTap) {
+  base::TimeTicks event_time = base::TimeTicks::Now();
+
+  gesture_provider_->UpdateDoubleTapSupportForPlatform(false);
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_UP);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_SINGLE_TAP_CONFIRMED, GetMostRecentGestureEventType());
+}
+
+// Verify that a DOWN followed shortly by an UP will trigger
+// a GESTURE_SINGLE_TAP_UNCONFIRMED event if double-tap is enabled.
+TEST_F(GestureProviderTest, GestureSingleTapWithDelay) {
+  base::TimeTicks event_time = base::TimeTicks::Now();
+
+  gesture_provider_->UpdateDoubleTapSupportForPlatform(true);
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_UP);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_SINGLE_TAP_UNCONFIRMED, GetMostRecentGestureEventType());
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_SINGLE_TAP_CONFIRMED));
+}
+
+// Verify that a DOWN followed by a MOVE will trigger fling (but not LONG).
+TEST_F(GestureProviderTest, GestureFlingAndCancelLongPress) {
+  base::TimeTicks event_time = TimeTicks::Now();
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX * 10,
+                            kFakeCoordY * 10);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX * 10,
+                            kFakeCoordY * 10);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_FLING_START, GetMostRecentGestureEventType());
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_LONG_PRESS));
+}
+
+// Verify that for a normal scroll the following events are sent:
+// - GESTURE_SCROLL_BEGIN
+// - GESTURE_SCROLL_UPDATE
+// - GESTURE_SCROLL_END
+TEST_F(GestureProviderTest, ScrollEventActionUpSequence) {
+  CheckScrollEventSequenceForEndActionType(MotionEvent::ACTION_UP);
+}
+
+// Verify that for a cancelled scroll the following events are sent:
+// - GESTURE_SCROLL_BEGIN
+// - GESTURE_SCROLL_UPDATE
+// - GESTURE_SCROLL_END
+TEST_F(GestureProviderTest, ScrollEventActionCancelSequence) {
+  CheckScrollEventSequenceForEndActionType(MotionEvent::ACTION_CANCEL);
+}
+
+// Verify that for a normal fling (fling after scroll) the following events are
+// sent:
+// - GESTURE_SCROLL_BEGIN
+// - GESTURE_FLING_START
+TEST_F(GestureProviderTest, FlingEventSequence) {
+  base::TimeTicks event_time = base::TimeTicks::Now();
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX * 5,
+                            kFakeCoordY * 5);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_TRUE(gesture_provider_->IsScrollInProgress());
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_BEGIN));
+  EXPECT_EQ(GESTURE_SCROLL_UPDATE, GetMostRecentGestureEventType());
+  ASSERT_EQ(4U, GetReceivedGestureCount());
+  ASSERT_EQ(GESTURE_SCROLL_BEGIN, GetReceivedGesture(2).type);
+
+  // We don't want to take a dependency here on exactly how hints are calculated
+  // for a fling (eg. may depend on velocity), so just validate the direction.
+  int hint_x = GetReceivedGesture(2).data.scroll_begin.delta_x_hint;
+  int hint_y = GetReceivedGesture(2).data.scroll_begin.delta_y_hint;
+  EXPECT_TRUE(hint_x > 0 && hint_y > 0 && hint_x > hint_y)
+      << "ScrollBegin hint should be in positive X axis";
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 3,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX * 10,
+                            kFakeCoordY * 10);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_FALSE(gesture_provider_->IsScrollInProgress());
+  EXPECT_EQ(GESTURE_FLING_START, GetMostRecentGestureEventType());
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_SCROLL_END));
+  EXPECT_EQ(event_time + kFiveMilliseconds * 3,
+            GetMostRecentGestureEvent().time)
+      << "FlingStart should have the time of the ACTION_UP";
+}
+
+TEST_F(GestureProviderTest, TapCancelledWhenWindowFocusLost) {
+  const base::TimeTicks event_time = TimeTicks::Now();
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+
+  Wait(GetShowPressTimeout() + kFiveMilliseconds);
+  EXPECT_EQ(GESTURE_SHOW_PRESS, GetMostRecentGestureEventType());
+
+  Wait(GetLongPressTimeout() + kFiveMilliseconds);
+  EXPECT_EQ(GESTURE_LONG_PRESS, GetMostRecentGestureEventType());
+
+  // The long press triggers window focus loss by opening a context menu
+  gesture_provider_->CancelActiveTouchSequence();
+  EXPECT_EQ(GESTURE_TAP_CANCEL, GetMostRecentGestureEventType());
+}
+
+TEST_F(GestureProviderTest, TapCancelledWhenScrollBegins) {
+  base::TimeTicks event_time = base::TimeTicks::Now();
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX + 50,
+                            kFakeCoordY + 50);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  EXPECT_EQ(GESTURE_SCROLL_UPDATE, GetMostRecentGestureEventType());
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_TAP_CANCEL));
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX + 100,
+                            kFakeCoordY + 100);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_FLING_START, GetMostRecentGestureEventType());
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_SCROLL_END));
+}
+
+TEST_F(GestureProviderTest, DoubleTap) {
+  base::TimeTicks event_time = base::TimeTicks::Now();
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY);
+  gesture_provider_->OnTouchEvent(event);
+  EXPECT_EQ(GESTURE_SINGLE_TAP_UNCONFIRMED, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_DOWN,
+                            kFakeCoordX,
+                            kFakeCoordY);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+
+  // Moving a very small amount of distance should not trigger the double tap
+  // drag zoom mode.
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 3,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX,
+                            kFakeCoordY + 1);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 3,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY + 1);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_DOUBLE_TAP, GetMostRecentGestureEventType());
+}
+
+TEST_F(GestureProviderTest, DoubleTapDragZoom) {
+  const base::TimeTicks down_time_1 = TimeTicks::Now();
+  const base::TimeTicks down_time_2 = down_time_1 + kFiveMilliseconds * 20;
+
+  MockMotionEvent event =
+      ObtainMotionEvent(down_time_1, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  event = ObtainMotionEvent(down_time_1 + kFiveMilliseconds,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY);
+  gesture_provider_->OnTouchEvent(event);
+  EXPECT_EQ(GESTURE_SINGLE_TAP_UNCONFIRMED, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(
+      down_time_2, MotionEvent::ACTION_DOWN, kFakeCoordX, kFakeCoordY);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX,
+                            kFakeCoordY + 100);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_BEGIN));
+  const GestureEventParams* scroll_begin_gesture = GetActiveScrollBeginEvent();
+  ASSERT_TRUE(!!scroll_begin_gesture);
+  EXPECT_EQ(0, scroll_begin_gesture->data.scroll_begin.delta_x_hint);
+  EXPECT_EQ(100, scroll_begin_gesture->data.scroll_begin.delta_y_hint);
+  EXPECT_EQ(GESTURE_PINCH_BEGIN, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX,
+                            kFakeCoordY + 200);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_UPDATE));
+  EXPECT_EQ(GESTURE_PINCH_UPDATE, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds * 3,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY + 200);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_PINCH_END));
+  EXPECT_EQ(GESTURE_SCROLL_END, GetMostRecentGestureEventType());
+}
+
+TEST_F(GestureProviderTest, DoubleTapDragZoomCancelledOnSecondaryPointerDown) {
+  const base::TimeTicks down_time_1 = TimeTicks::Now();
+  const base::TimeTicks down_time_2 = down_time_1 + kFiveMilliseconds * 20;
+
+  MockMotionEvent event =
+      ObtainMotionEvent(down_time_1, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(down_time_1 + kFiveMilliseconds,
+                            MotionEvent::ACTION_UP);
+  gesture_provider_->OnTouchEvent(event);
+  EXPECT_EQ(GESTURE_SINGLE_TAP_UNCONFIRMED, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(down_time_2, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_TAP_CANCEL));
+
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds * 10,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX,
+                            kFakeCoordY - 30);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_BEGIN));
+  EXPECT_EQ(GESTURE_PINCH_BEGIN, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds * 20,
+                            MotionEvent::ACTION_POINTER_DOWN,
+                            kFakeCoordX,
+                            kFakeCoordY - 30,
+                            kFakeCoordX + 50,
+                            kFakeCoordY + 50);
+  gesture_provider_->OnTouchEvent(event);
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_PINCH_END));
+  EXPECT_EQ(GESTURE_SCROLL_END, GetMostRecentGestureEventType());
+  const size_t gesture_count = GetReceivedGestureCount();
+
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds * 30,
+                            MotionEvent::ACTION_POINTER_UP,
+                            kFakeCoordX,
+                            kFakeCoordY - 30,
+                            kFakeCoordX + 50,
+                            kFakeCoordY + 50);
+  gesture_provider_->OnTouchEvent(event);
+  EXPECT_EQ(gesture_count, GetReceivedGestureCount());
+}
+
+// Generate a scroll gesture and verify that the resulting scroll motion event
+// has both absolute and relative position information.
+TEST_F(GestureProviderTest, ScrollUpdateValues) {
+  const int delta_x = 16;
+  const int delta_y = 84;
+
+  const base::TimeTicks event_time = TimeTicks::Now();
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  // Move twice so that we get two GESTURE_SCROLL_UPDATE events and can compare
+  // the relative and absolute coordinates.
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX - delta_x / 2,
+                            kFakeCoordY - delta_y / 2);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX - delta_x,
+                            kFakeCoordY - delta_y);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  // Make sure the reported gesture event has all the expected data.
+  ASSERT_LT(0U, GetReceivedGestureCount());
+  GestureEventParams gesture = GetMostRecentGestureEvent();
+  EXPECT_EQ(GESTURE_SCROLL_UPDATE, gesture.type);
+  EXPECT_EQ(event_time + kFiveMilliseconds * 2, gesture.time);
+  EXPECT_EQ(kFakeCoordX - delta_x, gesture.x);
+  EXPECT_EQ(kFakeCoordY - delta_y, gesture.y);
+
+  // No horizontal delta because of snapping.
+  EXPECT_EQ(0, gesture.data.scroll_update.delta_x);
+  EXPECT_EQ(-delta_y / 2, gesture.data.scroll_update.delta_y);
+}
+
+// Generate a scroll gesture and verify that the resulting scroll begin event
+// has the expected hint values.
+TEST_F(GestureProviderTest, ScrollBeginValues) {
+  const int delta_x = 13;
+  const int delta_y = 89;
+
+  const base::TimeTicks event_time = TimeTicks::Now();
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  // Move twice such that the first event isn't sufficient to start
+  // scrolling on it's own.
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX + 2,
+                            kFakeCoordY + 1);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_FALSE(gesture_provider_->IsScrollInProgress());
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX + delta_x,
+                            kFakeCoordY + delta_y);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_TRUE(gesture_provider_->IsScrollInProgress());
+
+  const GestureEventParams* scroll_begin_gesture = GetActiveScrollBeginEvent();
+  ASSERT_TRUE(!!scroll_begin_gesture);
+  EXPECT_EQ(delta_x, scroll_begin_gesture->data.scroll_begin.delta_x_hint);
+  EXPECT_EQ(delta_y, scroll_begin_gesture->data.scroll_begin.delta_y_hint);
+}
+
+TEST_F(GestureProviderTest, LongPressAndTapCancelledWhenScrollBegins) {
+  base::TimeTicks event_time = base::TimeTicks::Now();
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX * 5,
+                            kFakeCoordY * 5);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX * 10,
+                            kFakeCoordY * 10);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  const base::TimeDelta long_press_timeout =
+      GetLongPressTimeout() + GetShowPressTimeout() + kFiveMilliseconds * 2;
+  Wait(long_press_timeout);
+
+  // No LONG_TAP as the LONG_PRESS timer is cancelled.
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_LONG_PRESS));
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_LONG_TAP));
+}
+
+// Verify that LONG_TAP is triggered after LONG_PRESS followed by an UP.
+TEST_F(GestureProviderTest, GestureLongTap) {
+  base::TimeTicks event_time = base::TimeTicks::Now();
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  const base::TimeDelta long_press_timeout =
+      GetLongPressTimeout() + GetShowPressTimeout() + kFiveMilliseconds * 2;
+  Wait(long_press_timeout);
+
+  EXPECT_EQ(GESTURE_LONG_PRESS, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(event_time + kOneSecond, MotionEvent::ACTION_UP);
+  gesture_provider_->OnTouchEvent(event);
+  EXPECT_EQ(GESTURE_LONG_TAP, GetMostRecentGestureEventType());
+}
+
+TEST_F(GestureProviderTest, GestureLongPressDoesNotPreventScrolling) {
+  base::TimeTicks event_time = base::TimeTicks::Now();
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  const base::TimeDelta long_press_timeout =
+      GetLongPressTimeout() + GetShowPressTimeout() + kFiveMilliseconds * 2;
+  Wait(long_press_timeout);
+
+  EXPECT_EQ(GESTURE_LONG_PRESS, GetMostRecentGestureEventType());
+  event = ObtainMotionEvent(event_time + long_press_timeout,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX + 100,
+                            kFakeCoordY + 100);
+  gesture_provider_->OnTouchEvent(event);
+
+  EXPECT_EQ(GESTURE_SCROLL_UPDATE, GetMostRecentGestureEventType());
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_BEGIN));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_TAP_CANCEL));
+
+  event = ObtainMotionEvent(event_time + long_press_timeout,
+                            MotionEvent::ACTION_UP);
+  gesture_provider_->OnTouchEvent(event);
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_LONG_TAP));
+}
+
+TEST_F(GestureProviderTest, NoGestureLongPressDuringDoubleTap) {
+  base::TimeTicks event_time = base::TimeTicks::Now();
+
+  MockMotionEvent event = ObtainMotionEvent(
+      event_time, MotionEvent::ACTION_DOWN, kFakeCoordX, kFakeCoordY);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY);
+  gesture_provider_->OnTouchEvent(event);
+  EXPECT_EQ(GESTURE_SINGLE_TAP_UNCONFIRMED, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_DOWN,
+                            kFakeCoordX,
+                            kFakeCoordY);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+  EXPECT_TRUE(gesture_provider_->IsDoubleTapInProgress());
+
+  const base::TimeDelta long_press_timeout =
+      GetLongPressTimeout() + GetShowPressTimeout() + kFiveMilliseconds * 2;
+  Wait(long_press_timeout);
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_LONG_PRESS));
+
+  event = ObtainMotionEvent(event_time + long_press_timeout,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX + 20,
+                            kFakeCoordY + 20);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_PINCH_BEGIN, GetMostRecentGestureEventType());
+  EXPECT_TRUE(gesture_provider_->IsDoubleTapInProgress());
+
+  event = ObtainMotionEvent(event_time + long_press_timeout + kFiveMilliseconds,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY + 1);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_SCROLL_END, GetMostRecentGestureEventType());
+  EXPECT_FALSE(gesture_provider_->IsDoubleTapInProgress());
+}
+
+// Verify that the touch slop region is removed from the first scroll delta to
+// avoid a jump when starting to scroll.
+TEST_F(GestureProviderTest, TouchSlopRemovedFromScroll) {
+  const int scaled_touch_slop = GetTouchSlop();
+  const int scroll_delta = 5;
+
+  base::TimeTicks event_time = base::TimeTicks::Now();
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX,
+                            kFakeCoordY + scaled_touch_slop + scroll_delta);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  EXPECT_EQ(GESTURE_SCROLL_UPDATE, GetMostRecentGestureEventType());
+  GestureEventParams gesture = GetMostRecentGestureEvent();
+  EXPECT_EQ(0, gesture.data.scroll_update.delta_x);
+  EXPECT_EQ(scroll_delta, gesture.data.scroll_update.delta_y);
+}
+
+TEST_F(GestureProviderTest, NoDoubleTapWhenExplicitlyDisabled) {
+  gesture_provider_->UpdateDoubleTapSupportForPlatform(false);
+
+  base::TimeTicks event_time = base::TimeTicks::Now();
+  MockMotionEvent event = ObtainMotionEvent(
+      event_time, MotionEvent::ACTION_DOWN, kFakeCoordX, kFakeCoordY);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(1U, GetReceivedGestureCount());
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_SINGLE_TAP_CONFIRMED, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_DOWN,
+                            kFakeCoordX,
+                            kFakeCoordY);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 3,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_SINGLE_TAP_CONFIRMED, GetMostRecentGestureEventType());
+}
+
+TEST_F(GestureProviderTest, NoDoubleTapDragZoomWhenDisabledOnPlatform) {
+  const base::TimeTicks down_time_1 = TimeTicks::Now();
+  const base::TimeTicks down_time_2 = down_time_1 + kFiveMilliseconds * 20;
+
+  gesture_provider_->UpdateDoubleTapSupportForPlatform(false);
+
+  MockMotionEvent event =
+      ObtainMotionEvent(down_time_1, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  event = ObtainMotionEvent(down_time_1 + kFiveMilliseconds,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY);
+  gesture_provider_->OnTouchEvent(event);
+
+  event = ObtainMotionEvent(
+      down_time_2, MotionEvent::ACTION_DOWN, kFakeCoordX, kFakeCoordY);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX,
+                            kFakeCoordY + 100);
+
+  // The move should become a scroll, as doubletap drag zoom is disabled.
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_BEGIN));
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_PINCH_BEGIN));
+
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX,
+                            kFakeCoordY + 200);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_SCROLL_UPDATE, GetMostRecentGestureEventType());
+  EXPECT_EQ(down_time_2 + kFiveMilliseconds * 2,
+            GetMostRecentGestureEvent().time);
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_PINCH_UPDATE));
+
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds * 3,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY + 200);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_PINCH_END));
+}
+
+// Verify that double tap drag zoom feature is not invoked when the gesture
+// handler is told to disable double tap gesture detection.
+// The second tap sequence should be treated just as the first would be.
+TEST_F(GestureProviderTest, NoDoubleTapDragZoomWhenDisabledOnPage) {
+  const base::TimeTicks down_time_1 = TimeTicks::Now();
+  const base::TimeTicks down_time_2 = down_time_1 + kFiveMilliseconds * 20;
+
+  gesture_provider_->UpdateDoubleTapSupportForPage(false);
+
+  MockMotionEvent event =
+      ObtainMotionEvent(down_time_1, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  event = ObtainMotionEvent(down_time_1 + kFiveMilliseconds,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY);
+  gesture_provider_->OnTouchEvent(event);
+
+  event = ObtainMotionEvent(
+      down_time_2, MotionEvent::ACTION_DOWN, kFakeCoordX, kFakeCoordY);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX,
+                            kFakeCoordY + 100);
+
+  // The move should become a scroll, as double tap drag zoom is disabled.
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_BEGIN));
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_PINCH_BEGIN));
+
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX,
+                            kFakeCoordY + 200);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_SCROLL_UPDATE, GetMostRecentGestureEventType());
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_PINCH_UPDATE));
+
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds * 3,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY + 200);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_PINCH_END));
+}
+
+// Verify that updating double tap support during a double tap drag zoom
+// disables double tap detection after the gesture has ended.
+TEST_F(GestureProviderTest, FixedPageScaleDuringDoubleTapDragZoom) {
+  base::TimeTicks down_time_1 = TimeTicks::Now();
+  base::TimeTicks down_time_2 = down_time_1 + kFiveMilliseconds * 20;
+
+  // Start a double-tap drag gesture.
+  MockMotionEvent event =
+      ObtainMotionEvent(down_time_1, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  event = ObtainMotionEvent(down_time_1 + kFiveMilliseconds,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY);
+  gesture_provider_->OnTouchEvent(event);
+  event = ObtainMotionEvent(
+      down_time_2, MotionEvent::ACTION_DOWN, kFakeCoordX, kFakeCoordY);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX,
+                            kFakeCoordY + 100);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_BEGIN));
+  EXPECT_EQ(GESTURE_PINCH_BEGIN, GetMostRecentGestureEventType());
+
+  // Simulate setting a fixed page scale (or a mobile viewport);
+  // this should not disrupt the current double-tap gesture.
+  gesture_provider_->UpdateDoubleTapSupportForPage(false);
+
+  // Double tap zoom updates should continue.
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX,
+                            kFakeCoordY + 200);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_UPDATE));
+  EXPECT_EQ(GESTURE_PINCH_UPDATE, GetMostRecentGestureEventType());
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds * 3,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY + 200);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_PINCH_END));
+  EXPECT_EQ(GESTURE_SCROLL_END, GetMostRecentGestureEventType());
+
+  // The double-tap gesture has finished, but the page scale is fixed.
+  // The same event sequence should not generate any double tap getsures.
+  gestures_.clear();
+  down_time_1 += kFiveMilliseconds * 40;
+  down_time_2 += kFiveMilliseconds * 40;
+
+  // Start a double-tap drag gesture.
+  event = ObtainMotionEvent(down_time_1, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  event = ObtainMotionEvent(down_time_1 + kFiveMilliseconds,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY);
+  gesture_provider_->OnTouchEvent(event);
+  event = ObtainMotionEvent(
+      down_time_2, MotionEvent::ACTION_DOWN, kFakeCoordX, kFakeCoordY);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX,
+                            kFakeCoordY + 100);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_BEGIN));
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_PINCH_BEGIN));
+
+  // Double tap zoom updates should not be sent.
+  // Instead, the second tap drag becomes a scroll gesture sequence.
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX,
+                            kFakeCoordY + 200);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_UPDATE));
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_PINCH_UPDATE));
+  event = ObtainMotionEvent(down_time_2 + kFiveMilliseconds * 3,
+                            MotionEvent::ACTION_UP,
+                            kFakeCoordX,
+                            kFakeCoordY + 200);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_PINCH_END));
+}
+
+// Verify that pinch zoom sends the proper event sequence.
+TEST_F(GestureProviderTest, PinchZoom) {
+  base::TimeTicks event_time = base::TimeTicks::Now();
+  const int scaled_touch_slop = GetTouchSlop();
+
+  gesture_provider_->UpdateMultiTouchSupport(true);
+
+  int secondary_coord_x = kFakeCoordX + 20 * scaled_touch_slop;
+  int secondary_coord_y = kFakeCoordY + 20 * scaled_touch_slop;
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(event_time,
+                            MotionEvent::ACTION_POINTER_DOWN,
+                            kFakeCoordX,
+                            kFakeCoordY,
+                            secondary_coord_x,
+                            secondary_coord_y);
+  gesture_provider_->OnTouchEvent(event);
+  EXPECT_EQ(1U, GetReceivedGestureCount());
+
+  secondary_coord_x += 5 * scaled_touch_slop;
+  secondary_coord_y += 5 * scaled_touch_slop;
+
+  event = ObtainMotionEvent(event_time,
+                            MotionEvent::ACTION_MOVE,
+                            kFakeCoordX,
+                            kFakeCoordY,
+                            secondary_coord_x,
+                            secondary_coord_y);
+
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_PINCH_BEGIN));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_BEGIN));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_PINCH_UPDATE));
+  EXPECT_TRUE(HasReceivedGesture(GESTURE_SCROLL_UPDATE));
+
+  event = ObtainMotionEvent(event_time,
+                            MotionEvent::ACTION_POINTER_UP,
+                            kFakeCoordX,
+                            kFakeCoordY,
+                            secondary_coord_x,
+                            secondary_coord_y);
+
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_PINCH_END, GetMostRecentGestureEventType());
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_SCROLL_END));
+
+  event = ObtainMotionEvent(event_time, MotionEvent::ACTION_UP);
+  gesture_provider_->OnTouchEvent(event);
+  EXPECT_EQ(GESTURE_SCROLL_END, GetMostRecentGestureEventType());
+}
+
+// Verify that the timer of LONG_PRESS will be cancelled when scrolling begins
+// so LONG_PRESS and LONG_TAP won't be triggered.
+TEST_F(GestureProviderTest, GesturesCancelledAfterLongPressCausesLostFocus) {
+  base::TimeTicks event_time = base::TimeTicks::Now();
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+
+  const base::TimeDelta long_press_timeout =
+      GetLongPressTimeout() + GetShowPressTimeout() + kFiveMilliseconds * 2;
+  Wait(long_press_timeout);
+  EXPECT_EQ(GESTURE_LONG_PRESS, GetMostRecentGestureEventType());
+
+  gesture_provider_->CancelActiveTouchSequence();
+  EXPECT_EQ(GESTURE_TAP_CANCEL, GetMostRecentGestureEventType());
+
+  event = ObtainMotionEvent(event_time + long_press_timeout,
+                            MotionEvent::ACTION_UP);
+  gesture_provider_->OnTouchEvent(event);
+  EXPECT_FALSE(HasReceivedGesture(GESTURE_LONG_TAP));
+}
+
+// Verify that ignoring the remaining touch sequence triggers proper touch and
+// gesture cancellation.
+TEST_F(GestureProviderTest, CancelActiveTouchSequence) {
+  base::TimeTicks event_time = base::TimeTicks::Now();
+
+  gesture_provider_->CancelActiveTouchSequence();
+  EXPECT_EQ(0U, GetReceivedGestureCount());
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+
+  gesture_provider_->CancelActiveTouchSequence();
+  EXPECT_EQ(GESTURE_TAP_CANCEL, GetMostRecentGestureEventType());
+
+  // Subsequent MotionEvent's are dropped until ACTION_DOWN.
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds,
+                            MotionEvent::ACTION_MOVE);
+  EXPECT_FALSE(gesture_provider_->OnTouchEvent(event));
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 2,
+                            MotionEvent::ACTION_UP);
+  EXPECT_FALSE(gesture_provider_->OnTouchEvent(event));
+
+  event = ObtainMotionEvent(event_time + kFiveMilliseconds * 3,
+                            MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(GESTURE_TAP_DOWN, GetMostRecentGestureEventType());
+}
+
+}  // namespace ui