Notify Blink about start of gesture scroll through a queued event.

third_party/WebKit/Source/core/events/PointerEventFactory.cpp

Index: third_party/WebKit/Source/core/events/PointerEventFactory.cpp
diff --git a/third_party/WebKit/Source/core/events/PointerEventFactory.cpp b/third_party/WebKit/Source/core/events/PointerEventFactory.cpp
index ce7f70de880c1b093b1bdb718f15302492936315..e937a8322f51c209099fab182c0e7ead2f34ddab 100644
--- a/third_party/WebKit/Source/core/events/PointerEventFactory.cpp
+++ b/third_party/WebKit/Source/core/events/PointerEventFactory.cpp
@@ -62,8 +62,8 @@ float getPointerEventPressure(float force, int buttons)
     return force;
 }
 
-void PointerEventFactory::setIdTypeButtons(PointerEventInit &pointerEventInit,
-    const WebPointerProperties &pointerProperties, unsigned buttons)
+void PointerEventFactory::setIdTypeButtons(PointerEventInit& pointerEventInit,
+    const WebPointerProperties& pointerProperties, unsigned buttons)
 {
     const WebPointerProperties::PointerType pointerType = pointerProperties.pointerType;
     const IncomingId incomingId(pointerType, pointerProperties.id);
@@ -75,6 +75,15 @@ void PointerEventFactory::setIdTypeButtons(PointerEventInit &pointerEventInit,
     pointerEventInit.setIsPrimary(isPrimary(pointerId));
 }
 
+void PointerEventFactory::setBubblesAndCancelable(PointerEventInit& pointerEventInit,
+    const AtomicString& type)
+{
+    pointerEventInit.setBubbles(type != EventTypeNames::pointerenter
+        && type != EventTypeNames::pointerleave);
+    pointerEventInit.setCancelable(type != EventTypeNames::pointerenter
+        && type != EventTypeNames::pointerleave && type != EventTypeNames::pointercancel);
+}
+
 PointerEvent* PointerEventFactory::create(
     const AtomicString& mouseEventName, const PlatformMouseEvent& mouseEvent,
     EventTarget* relatedTarget,
@@ -85,6 +94,7 @@ PointerEvent* PointerEventFactory::create(
     PointerEventInit pointerEventInit;
 
     setIdTypeButtons(pointerEventInit, mouseEvent.pointerProperties(), buttons);
+    setBubblesAndCancelable(pointerEventInit, pointerEventName);
 
     pointerEventInit.setScreenX(mouseEvent.globalPosition().x());
     pointerEventInit.setScreenY(mouseEvent.globalPosition().y());
@@ -110,13 +120,6 @@ PointerEvent* PointerEventFactory::create(
         || (pointerEventName == EventTypeNames::pointerup && buttons != 0))
         pointerEventName = EventTypeNames::pointermove;
 
-    pointerEventInit.setBubbles(
-        pointerEventName != EventTypeNames::pointerenter
-        && pointerEventName != EventTypeNames::pointerleave);
-    pointerEventInit.setCancelable(
-        pointerEventName != EventTypeNames::pointerenter
-        && pointerEventName != EventTypeNames::pointerleave
-        && pointerEventName != EventTypeNames::pointercancel);
 
     pointerEventInit.setView(view);
     if (relatedTarget)
@@ -166,13 +169,14 @@ PointerEvent* PointerEventFactory::create(const AtomicString& type,
     return PointerEvent::create(type, pointerEventInit);
 }
 
-
-PointerEvent* PointerEventFactory::createPointerCancelEvent(const PlatformTouchPoint& touchPoint)
+PointerEvent* PointerEventFactory::createPointerCancelEvent(
+    const int pointerId, const WebPointerProperties::PointerType pointerType)
 {
     PointerEventInit pointerEventInit;
 
-    setIdTypeButtons(pointerEventInit, touchPoint.pointerProperties(), 0);
-
+    pointerEventInit.setPointerId(pointerId);

[bokan, 2016/04/12 22:42:45]

setIdTypeButtons used to add a bunch of data into some internal maps. That's no
longer needed because all of those were keeping track of Mouse/Touch events <->
Pointer event mappings and the cancel is no longer related to one. Is that
correct?

[mustaq, 2016/04/13 14:56:27]

You are right that we don't need those mappings: the mapping store pointer
specific states (JS-visible pointerId, incoming raw id, buttons state etc). Here
we have the |pointerId| specified directly, so no need to consult the maps. The
state |buttons| is irrelevant for pointercancel.

[bokan, 2016/04/13 22:59:48]

Acknowledged.

+    pointerEventInit.setPointerType(pointerTypeNameForWebPointPointerType(pointerType));
+    pointerEventInit.setIsPrimary(isPrimary(pointerId));
     pointerEventInit.setBubbles(true);
     pointerEventInit.setCancelable(false);
 
@@ -223,11 +227,8 @@ PointerEvent* PointerEventFactory::createPointerTransitionEvent(
     pointerEventInit.setButtons(pointerEvent->buttons());
     pointerEventInit.setPressure(pointerEvent->pressure());
 
-    pointerEventInit.setBubbles(type != EventTypeNames::pointerenter
-        && type != EventTypeNames::pointerleave);
-    pointerEventInit.setCancelable(type != EventTypeNames::pointerenter
-        && type != EventTypeNames::pointerleave
-        && type != EventTypeNames::pointercancel);
+    setBubblesAndCancelable(pointerEventInit, type);
+
     if (relatedTarget)
         pointerEventInit.setRelatedTarget(relatedTarget);
 
@@ -289,10 +290,8 @@ int PointerEventFactory::addIdAndActiveButtons(const IncomingId p,
     return mappedId;
 }
 
-bool PointerEventFactory::remove(
-    const PointerEvent* pointerEvent)
+bool PointerEventFactory::remove(const int mappedId)
 {
-    int mappedId = pointerEvent->pointerId();
     // Do not remove mouse pointer id as it should always be there
     if (mappedId == s_mouseId || !m_pointerIdMapping.contains(mappedId))
         return false;
@@ -307,6 +306,21 @@ bool PointerEventFactory::remove(
     return true;
 }
 
+HeapVector<int> PointerEventFactory::getPointerIdsOfType(WebPointerProperties::PointerType pointerType)
+{
+    HeapVector<int> mappedIds;
+
+    for (auto iter = m_pointerIdMapping.begin(); iter != m_pointerIdMapping.end(); ++iter) {
+        int mappedId = iter->key;
+        if (iter->value.incomingId.pointerType() == static_cast<int>(pointerType))
+            mappedIds.append(mappedId);
+    }
+
+    // Sorting for a predictable ordering.
+    std::sort(mappedIds.begin(), mappedIds.end());
+    return mappedIds;
+}
+
 bool PointerEventFactory::isPrimary(int mappedId) const
 {
     if (!m_pointerIdMapping.contains(mappedId))