Revert of Move touch slop suppression from LegacyTouchEventQueue to TouchEventManager

third_party/WebKit/Source/core/input/TouchEventManager.cpp

Index: third_party/WebKit/Source/core/input/TouchEventManager.cpp
diff --git a/third_party/WebKit/Source/core/input/TouchEventManager.cpp b/third_party/WebKit/Source/core/input/TouchEventManager.cpp
index 165b255623a1b97501e1d09320796dbd6511b5c0..8d161e1ef2727d4b4eb29e42defb9eefbf560174 100644
--- a/third_party/WebKit/Source/core/input/TouchEventManager.cpp
+++ b/third_party/WebKit/Source/core/input/TouchEventManager.cpp
@@ -62,18 +62,6 @@
   TouchEventDispatchResultTypeMax,
 };
 
-bool IsTouchSequenceStart(const PlatformTouchEvent& event) {
-  if (!event.touchPoints().size())
-    return false;
-  if (event.type() != PlatformEvent::TouchStart)
-    return false;
-  for (const auto& point : event.touchPoints()) {
-    if (point.state() != PlatformTouchPoint::TouchPressed)
-      return false;
-  }
-  return true;
-}
-
 // Defining this class type local to dispatchTouchEvents() and annotating
 // it with STACK_ALLOCATED(), runs into MSVC(VS 2013)'s C4822 warning
 // that the local class doesn't provide a local definition for 'operator new'.
@@ -108,7 +96,6 @@
   m_regionForTouchID.clear();
   m_touchPressed = false;
   m_currentEvent = PlatformEvent::NoType;
-  m_suppressingTouchmovesWithinSlop = false;
   m_currentTouchAction = TouchActionAuto;
 }
 
@@ -126,23 +113,6 @@
   // |changedTouches| attributes in the JS event. See
   // http://www.w3.org/TR/touch-events/#touchevent-interface for how these
   // lists fit together.
-
-  // Suppress all the touch moves in the slop region.
-  if (IsTouchSequenceStart(event))
-    m_suppressingTouchmovesWithinSlop = true;
-
-  if (event.type() == PlatformEvent::TouchEnd ||
-      event.type() == PlatformEvent::TouchCancel ||
-      event.touchPoints().size() > 1) {
-    m_suppressingTouchmovesWithinSlop = false;
-  }
-
-  if (m_suppressingTouchmovesWithinSlop &&
-      event.type() == PlatformEvent::TouchMove) {
-    if (!event.causesScrollingIfUncanceled())
-      return WebInputEventResult::HandledSuppressed;
-    m_suppressingTouchmovesWithinSlop = false;
-  }
 
   // Holds the complete set of touches on the screen.
   TouchList* touches = TouchList::create();