Send lostpointercapture on touch capturing

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 04490da249950fe039c2c8180037c7427548963f..c71c5d068212dca339463cac2d97003cfc0bf7d3 100644
--- a/third_party/WebKit/Source/core/events/PointerEventFactory.cpp
+++ b/third_party/WebKit/Source/core/events/PointerEventFactory.cpp
@@ -316,6 +316,16 @@ bool PointerEventFactory::isPrimary(int mappedId) const
     return m_primaryId[p.pointerType()] == mappedId;
 }
 
+WebPointerProperties::PointerType PointerEventFactory::getPointerType(
+    const int pointerId)
+{
+    if (m_pointerIdMapping.contains(pointerId)) {
+        return static_cast<WebPointerProperties::PointerType>(
+            m_pointerIdMapping.get(pointerId).incomingId.pointerType());
+    }
+    return WebPointerProperties::PointerType::Unknown;
+}
+
 bool PointerEventFactory::isActive(const int pointerId)
 {
     return m_pointerIdMapping.contains(pointerId);