Decouple EventWithLatencyInfo and WebInputEventTraits [extern templates]

content/common/input/web_input_event_traits_unittest.cc

Index: content/common/input/web_input_event_traits_unittest.cc
diff --git a/content/common/input/web_input_event_traits_unittest.cc b/content/common/input/web_input_event_traits_unittest.cc
index 7c773f4f45a691f5abeece374a86e16e3338af2c..d712f49bb08fae3e19a6ee7b52e3110ae8f2e66e 100644
--- a/content/common/input/web_input_event_traits_unittest.cc
+++ b/content/common/input/web_input_event_traits_unittest.cc
@@ -6,6 +6,7 @@
 
 #include <limits>
 
+#include "content/common/input/event_with_latency_info.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
@@ -21,6 +22,8 @@ using std::numeric_limits;
 namespace content {
 namespace {
 
+// TODO(tapted): Move the Coalesce tests to event_with_latency_info_unittest.cc.
+// Merge this test harness into EventWithLatencyInfoTest.
 class WebInputEventTraitsTest : public testing::Test {
  protected:
   static WebTouchPoint CreateTouchPoint(WebTouchPoint::State state, int id) {
@@ -30,200 +33,211 @@ class WebInputEventTraitsTest : public testing::Test {
     return touch;
   }
 
-  static WebTouchEvent CreateTouch(WebInputEvent::Type type) {
+  static TouchEventWithLatencyInfo CreateTouch(WebInputEvent::Type type) {
     return CreateTouch(type, 1);
   }
 
-  static WebTouchEvent CreateTouch(WebInputEvent::Type type,
-                                   unsigned touch_count) {
+  static TouchEventWithLatencyInfo CreateTouch(WebInputEvent::Type type,
+                                               unsigned touch_count) {
     WebTouchEvent event;
     event.touchesLength = touch_count;
     event.type = type;
-    return event;
+    return TouchEventWithLatencyInfo(event);
   }
 
-  static WebGestureEvent CreateGesture(WebInputEvent::Type type,
-                                       float x,
-                                       float y) {
+  static GestureEventWithLatencyInfo CreateGesture(WebInputEvent::Type type,
+                                                   float x,
+                                                   float y) {
     WebGestureEvent event;
     event.type = type;
     event.x = x;
     event.y = y;
-    return event;
+    return GestureEventWithLatencyInfo(event);
   }
 
-  static WebMouseWheelEvent CreateMouseWheel(float deltaX, float deltaY) {
+  static MouseWheelEventWithLatencyInfo CreateMouseWheel(float deltaX,
+                                                         float deltaY) {
     WebMouseWheelEvent event;
     event.type = WebInputEvent::MouseWheel;
     event.deltaX = deltaX;
     event.deltaY = deltaY;
-    return event;
+    return MouseWheelEventWithLatencyInfo(event);
   }
 };
 
+template <class T>
+bool CanCoalesce(const T& event_to_coalesce, const T& event) {
+  return event.CanCoalesceWith(event_to_coalesce);
+}
+
+template <class T>
+void Coalesce(const T& event_to_coalesce, T* event) {
+  return event->CoalesceWith(event_to_coalesce);
+}
+
 TEST_F(WebInputEventTraitsTest, TouchEventCoalescing) {
-  WebTouchEvent touch0 = CreateTouch(WebInputEvent::TouchStart);
-  WebTouchEvent touch1 = CreateTouch(WebInputEvent::TouchMove);
+  TouchEventWithLatencyInfo touch0 = CreateTouch(WebInputEvent::TouchStart);
+  TouchEventWithLatencyInfo touch1 = CreateTouch(WebInputEvent::TouchMove);
 
   // Non touch-moves won't coalesce.
-  EXPECT_FALSE(WebInputEventTraits::CanCoalesce(touch0, touch0));
+  EXPECT_FALSE(CanCoalesce(touch0, touch0));
 
   // Touches of different types won't coalesce.
-  EXPECT_FALSE(WebInputEventTraits::CanCoalesce(touch0, touch1));
+  EXPECT_FALSE(CanCoalesce(touch0, touch1));
 
   // Touch moves with idential touch lengths and touch ids should coalesce.
-  EXPECT_TRUE(WebInputEventTraits::CanCoalesce(touch1, touch1));
+  EXPECT_TRUE(CanCoalesce(touch1, touch1));
 
   // Touch moves with different touch ids should not coalesce.
   touch0 = CreateTouch(WebInputEvent::TouchMove);
   touch1 = CreateTouch(WebInputEvent::TouchMove);
-  touch0.touches[0].id = 7;
-  EXPECT_FALSE(WebInputEventTraits::CanCoalesce(touch0, touch1));
+  touch0.event.touches[0].id = 7;
+  EXPECT_FALSE(CanCoalesce(touch0, touch1));
   touch0 = CreateTouch(WebInputEvent::TouchMove, 2);
   touch1 = CreateTouch(WebInputEvent::TouchMove, 2);
-  touch0.touches[0].id = 1;
-  touch1.touches[0].id = 0;
-  EXPECT_FALSE(WebInputEventTraits::CanCoalesce(touch0, touch1));
+  touch0.event.touches[0].id = 1;
+  touch1.event.touches[0].id = 0;
+  EXPECT_FALSE(CanCoalesce(touch0, touch1));
 
   // Touch moves with different touch lengths should not coalesce.
   touch0 = CreateTouch(WebInputEvent::TouchMove, 1);
   touch1 = CreateTouch(WebInputEvent::TouchMove, 2);
-  EXPECT_FALSE(WebInputEventTraits::CanCoalesce(touch0, touch1));
+  EXPECT_FALSE(CanCoalesce(touch0, touch1));
 
   // Touch moves with identical touch ids in different orders should coalesce.
   touch0 = CreateTouch(WebInputEvent::TouchMove, 2);
   touch1 = CreateTouch(WebInputEvent::TouchMove, 2);
-  touch0.touches[0] = touch1.touches[1] =
+  touch0.event.touches[0] = touch1.event.touches[1] =
       CreateTouchPoint(WebTouchPoint::StateMoved, 1);
-  touch0.touches[1] = touch1.touches[0] =
+  touch0.event.touches[1] = touch1.event.touches[0] =
       CreateTouchPoint(WebTouchPoint::StateMoved, 0);
-  EXPECT_TRUE(WebInputEventTraits::CanCoalesce(touch0, touch1));
+  EXPECT_TRUE(CanCoalesce(touch0, touch1));
 
   // Pointers with the same ID's should coalesce.
   touch0 = CreateTouch(WebInputEvent::TouchMove, 2);
   touch1 = CreateTouch(WebInputEvent::TouchMove, 2);
-  touch0.touches[0] = touch1.touches[1] =
+  touch0.event.touches[0] = touch1.event.touches[1] =
       CreateTouchPoint(WebTouchPoint::StateMoved, 1);
-  WebInputEventTraits::Coalesce(touch0, &touch1);
-  ASSERT_EQ(1, touch1.touches[0].id);
-  ASSERT_EQ(0, touch1.touches[1].id);
-  EXPECT_EQ(WebTouchPoint::StateUndefined, touch1.touches[1].state);
-  EXPECT_EQ(WebTouchPoint::StateMoved, touch1.touches[0].state);
+  Coalesce(touch0, &touch1);
+  ASSERT_EQ(1, touch1.event.touches[0].id);
+  ASSERT_EQ(0, touch1.event.touches[1].id);
+  EXPECT_EQ(WebTouchPoint::StateUndefined, touch1.event.touches[1].state);
+  EXPECT_EQ(WebTouchPoint::StateMoved, touch1.event.touches[0].state);
 
   // Movement from now-stationary pointers should be preserved.
   touch0 = touch1 = CreateTouch(WebInputEvent::TouchMove, 2);
-  touch0.touches[0] = CreateTouchPoint(WebTouchPoint::StateMoved, 1);
-  touch1.touches[1] = CreateTouchPoint(WebTouchPoint::StateStationary, 1);
-  touch0.touches[1] = CreateTouchPoint(WebTouchPoint::StateStationary, 0);
-  touch1.touches[0] = CreateTouchPoint(WebTouchPoint::StateMoved, 0);
-  WebInputEventTraits::Coalesce(touch0, &touch1);
-  ASSERT_EQ(1, touch1.touches[0].id);
-  ASSERT_EQ(0, touch1.touches[1].id);
-  EXPECT_EQ(WebTouchPoint::StateMoved, touch1.touches[0].state);
-  EXPECT_EQ(WebTouchPoint::StateMoved, touch1.touches[1].state);
+  touch0.event.touches[0] = CreateTouchPoint(WebTouchPoint::StateMoved, 1);
+  touch1.event.touches[1] = CreateTouchPoint(WebTouchPoint::StateStationary, 1);
+  touch0.event.touches[1] = CreateTouchPoint(WebTouchPoint::StateStationary, 0);
+  touch1.event.touches[0] = CreateTouchPoint(WebTouchPoint::StateMoved, 0);
+  Coalesce(touch0, &touch1);
+  ASSERT_EQ(1, touch1.event.touches[0].id);
+  ASSERT_EQ(0, touch1.event.touches[1].id);
+  EXPECT_EQ(WebTouchPoint::StateMoved, touch1.event.touches[0].state);
+  EXPECT_EQ(WebTouchPoint::StateMoved, touch1.event.touches[1].state);
 
   // Touch moves with different dispatchTypes coalesce.
   touch0 = CreateTouch(WebInputEvent::TouchMove, 2);
-  touch0.dispatchType = WebInputEvent::DispatchType::Blocking;
+  touch0.event.dispatchType = WebInputEvent::DispatchType::Blocking;
   touch1 = CreateTouch(WebInputEvent::TouchMove, 2);
-  touch1.dispatchType = WebInputEvent::DispatchType::EventNonBlocking;
-  touch0.touches[0] = touch1.touches[1] =
+  touch1.event.dispatchType = WebInputEvent::DispatchType::EventNonBlocking;
+  touch0.event.touches[0] = touch1.event.touches[1] =
       CreateTouchPoint(WebTouchPoint::StateMoved, 1);
-  touch0.touches[1] = touch1.touches[0] =
+  touch0.event.touches[1] = touch1.event.touches[0] =
       CreateTouchPoint(WebTouchPoint::StateMoved, 0);
-  EXPECT_TRUE(WebInputEventTraits::CanCoalesce(touch0, touch1));
-  WebInputEventTraits::Coalesce(touch0, &touch1);
-  ASSERT_EQ(WebInputEvent::DispatchType::Blocking, touch1.dispatchType);
+  EXPECT_TRUE(CanCoalesce(touch0, touch1));
+  Coalesce(touch0, &touch1);
+  ASSERT_EQ(WebInputEvent::DispatchType::Blocking, touch1.event.dispatchType);
 
   touch0 = CreateTouch(WebInputEvent::TouchMove, 2);
-  touch0.dispatchType =
+  touch0.event.dispatchType =
       WebInputEvent::DispatchType::ListenersForcedNonBlockingPassive;
   touch1 = CreateTouch(WebInputEvent::TouchMove, 2);
-  touch1.dispatchType =
+  touch1.event.dispatchType =
       WebInputEvent::DispatchType::ListenersNonBlockingPassive;
-  touch0.touches[0] = touch1.touches[1] =
+  touch0.event.touches[0] = touch1.event.touches[1] =
       CreateTouchPoint(WebTouchPoint::StateMoved, 1);
-  touch0.touches[1] = touch1.touches[0] =
+  touch0.event.touches[1] = touch1.event.touches[0] =
       CreateTouchPoint(WebTouchPoint::StateMoved, 0);
-  EXPECT_TRUE(WebInputEventTraits::CanCoalesce(touch0, touch1));
-  WebInputEventTraits::Coalesce(touch0, &touch1);
+  EXPECT_TRUE(CanCoalesce(touch0, touch1));
+  Coalesce(touch0, &touch1);
   ASSERT_EQ(WebInputEvent::DispatchType::ListenersNonBlockingPassive,
-            touch1.dispatchType);
+            touch1.event.dispatchType);
 }
 
 TEST_F(WebInputEventTraitsTest, PinchEventCoalescing) {
-  WebGestureEvent pinch0 =
+  GestureEventWithLatencyInfo pinch0 =
       CreateGesture(WebInputEvent::GesturePinchBegin, 1, 1);
-  WebGestureEvent pinch1 =
+  GestureEventWithLatencyInfo pinch1 =
       CreateGesture(WebInputEvent::GesturePinchUpdate, 2, 2);
 
   // Only GesturePinchUpdate's coalesce.
-  EXPECT_FALSE(WebInputEventTraits::CanCoalesce(pinch0, pinch0));
+  EXPECT_FALSE(CanCoalesce(pinch0, pinch0));
 
   // Pinch gestures of different types should not coalesce.
-  EXPECT_FALSE(WebInputEventTraits::CanCoalesce(pinch0, pinch1));
+  EXPECT_FALSE(CanCoalesce(pinch0, pinch1));
 
   // Pinches with different focal points should not coalesce.
   pinch0 = CreateGesture(WebInputEvent::GesturePinchUpdate, 1, 1);
   pinch1 = CreateGesture(WebInputEvent::GesturePinchUpdate, 2, 2);
-  EXPECT_FALSE(WebInputEventTraits::CanCoalesce(pinch0, pinch1));
-  EXPECT_TRUE(WebInputEventTraits::CanCoalesce(pinch0, pinch0));
+  EXPECT_FALSE(CanCoalesce(pinch0, pinch1));
+  EXPECT_TRUE(CanCoalesce(pinch0, pinch0));
 
   // Coalesced scales are multiplicative.
   pinch0 = CreateGesture(WebInputEvent::GesturePinchUpdate, 1, 1);
-  pinch0.data.pinchUpdate.scale = 2.f;
+  pinch0.event.data.pinchUpdate.scale = 2.f;
   pinch1 = CreateGesture(WebInputEvent::GesturePinchUpdate, 1, 1);
-  pinch1.data.pinchUpdate.scale = 3.f;
-  EXPECT_TRUE(WebInputEventTraits::CanCoalesce(pinch0, pinch0));
-  WebInputEventTraits::Coalesce(pinch0, &pinch1);
-  EXPECT_EQ(2.f * 3.f, pinch1.data.pinchUpdate.scale);
+  pinch1.event.data.pinchUpdate.scale = 3.f;
+  EXPECT_TRUE(CanCoalesce(pinch0, pinch0));
+  Coalesce(pinch0, &pinch1);
+  EXPECT_EQ(2.f * 3.f, pinch1.event.data.pinchUpdate.scale);
 
   // Scales have a minimum value and can never reach 0.
   ASSERT_GT(numeric_limits<float>::min(), 0);
   pinch0 = CreateGesture(WebInputEvent::GesturePinchUpdate, 1, 1);
-  pinch0.data.pinchUpdate.scale = numeric_limits<float>::min() * 2.0f;
+  pinch0.event.data.pinchUpdate.scale = numeric_limits<float>::min() * 2.0f;
   pinch1 = CreateGesture(WebInputEvent::GesturePinchUpdate, 1, 1);
-  pinch1.data.pinchUpdate.scale = numeric_limits<float>::min() * 5.0f;
-  EXPECT_TRUE(WebInputEventTraits::CanCoalesce(pinch0, pinch1));
-  WebInputEventTraits::Coalesce(pinch0, &pinch1);
-  EXPECT_EQ(numeric_limits<float>::min(), pinch1.data.pinchUpdate.scale);
+  pinch1.event.data.pinchUpdate.scale = numeric_limits<float>::min() * 5.0f;
+  EXPECT_TRUE(CanCoalesce(pinch0, pinch1));
+  Coalesce(pinch0, &pinch1);
+  EXPECT_EQ(numeric_limits<float>::min(), pinch1.event.data.pinchUpdate.scale);
 
   // Scales have a maximum value and can never reach Infinity.
   pinch0 = CreateGesture(WebInputEvent::GesturePinchUpdate, 1, 1);
-  pinch0.data.pinchUpdate.scale = numeric_limits<float>::max() / 2.0f;
+  pinch0.event.data.pinchUpdate.scale = numeric_limits<float>::max() / 2.0f;
   pinch1 = CreateGesture(WebInputEvent::GesturePinchUpdate, 1, 1);
-  pinch1.data.pinchUpdate.scale = 10.0f;
-  EXPECT_TRUE(WebInputEventTraits::CanCoalesce(pinch0, pinch1));
-  WebInputEventTraits::Coalesce(pinch0, &pinch1);
-  EXPECT_EQ(numeric_limits<float>::max(), pinch1.data.pinchUpdate.scale);
+  pinch1.event.data.pinchUpdate.scale = 10.0f;
+  EXPECT_TRUE(CanCoalesce(pinch0, pinch1));
+  Coalesce(pinch0, &pinch1);
+  EXPECT_EQ(numeric_limits<float>::max(), pinch1.event.data.pinchUpdate.scale);
 }
 
 TEST_F(WebInputEventTraitsTest, WebMouseWheelEventCoalescing) {
-  WebMouseWheelEvent mouse_wheel_0 = CreateMouseWheel(1, 1);
-  WebMouseWheelEvent mouse_wheel_1 = CreateMouseWheel(2, 2);
+  MouseWheelEventWithLatencyInfo mouse_wheel_0 = CreateMouseWheel(1, 1);
+  MouseWheelEventWithLatencyInfo mouse_wheel_1 = CreateMouseWheel(2, 2);
 
   // WebMouseWheelEvent objects with same values except different deltaX and
   // deltaY should coalesce.
-  EXPECT_TRUE(WebInputEventTraits::CanCoalesce(mouse_wheel_0, mouse_wheel_1));
+  EXPECT_TRUE(CanCoalesce(mouse_wheel_0, mouse_wheel_1));
 
   // WebMouseWheelEvent objects with different modifiers should not coalesce.
   mouse_wheel_0 = CreateMouseWheel(1, 1);
   mouse_wheel_1 = CreateMouseWheel(1, 1);
-  mouse_wheel_0.modifiers = blink::WebInputEvent::ControlKey;
-  mouse_wheel_1.modifiers = blink::WebInputEvent::ShiftKey;
-  EXPECT_FALSE(WebInputEventTraits::CanCoalesce(mouse_wheel_0, mouse_wheel_1));
+  mouse_wheel_0.event.modifiers = blink::WebInputEvent::ControlKey;
+  mouse_wheel_1.event.modifiers = blink::WebInputEvent::ShiftKey;
+  EXPECT_FALSE(CanCoalesce(mouse_wheel_0, mouse_wheel_1));
 }
 
 // Coalescing preserves the newer timestamp.
 TEST_F(WebInputEventTraitsTest, TimestampCoalescing) {
-  WebMouseWheelEvent mouse_wheel_0 = CreateMouseWheel(1, 1);
-  mouse_wheel_0.timeStampSeconds = 5.0;
-  WebMouseWheelEvent mouse_wheel_1 = CreateMouseWheel(2, 2);
-  mouse_wheel_1.timeStampSeconds = 10.0;
-
-  EXPECT_TRUE(WebInputEventTraits::CanCoalesce(mouse_wheel_0, mouse_wheel_1));
-  WebInputEventTraits::Coalesce(mouse_wheel_1, &mouse_wheel_0);
-  EXPECT_EQ(10.0, mouse_wheel_0.timeStampSeconds);
+  MouseWheelEventWithLatencyInfo mouse_wheel_0 = CreateMouseWheel(1, 1);
+  mouse_wheel_0.event.timeStampSeconds = 5.0;
+  MouseWheelEventWithLatencyInfo mouse_wheel_1 = CreateMouseWheel(2, 2);
+  mouse_wheel_1.event.timeStampSeconds = 10.0;
+
+  EXPECT_TRUE(CanCoalesce(mouse_wheel_0, mouse_wheel_1));
+  Coalesce(mouse_wheel_1, &mouse_wheel_0);
+  EXPECT_EQ(10.0, mouse_wheel_0.event.timeStampSeconds);
 }
 
 // Very basic smoke test to ensure stringification doesn't explode.
@@ -240,11 +254,15 @@ TEST_F(WebInputEventTraitsTest, ToString) {
   mouse_wheel.type = WebInputEvent::MouseWheel;
   EXPECT_FALSE(WebInputEventTraits::ToString(mouse_wheel).empty());
 
-  WebGestureEvent gesture =
-      CreateGesture(WebInputEvent::GesturePinchBegin, 1, 1);
+  WebGestureEvent gesture;
+  gesture.type = WebInputEvent::GesturePinchBegin;
+  gesture.x = 1;
+  gesture.y = 1;
   EXPECT_FALSE(WebInputEventTraits::ToString(gesture).empty());
 
-  WebTouchEvent touch = CreateTouch(WebInputEvent::TouchStart);
+  WebTouchEvent touch;
+  touch.type = WebInputEvent::TouchStart;
+  touch.touchesLength = 1;
   EXPECT_FALSE(WebInputEventTraits::ToString(touch).empty());
 }