Touchmoves should not be suppressed if the touchstart is consumed

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 149cff36bc908842d65b6dc63fe73d9b538f3a66..57628ebfb6d3d4f06a88936e538cf67bd643ba7d 100644
--- a/third_party/WebKit/Source/core/input/TouchEventManager.cpp
+++ b/third_party/WebKit/Source/core/input/TouchEventManager.cpp
@@ -126,10 +126,8 @@ WebInputEventResult TouchEventManager::dispatchTouchEvents(
   // 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;
-
+  // Suppress the touch moves in the slop region when

[mustaq, 2017/02/17 15:24:01]

Lines 129-130 are meaningless now. Please delete.

[lanwei, 2017/02/21 18:10:04]

Done.

+  // m_suppressingTouchmovesWithinSlop is true.
   if (event.type() == WebInputEvent::TouchEnd ||
       event.type() == WebInputEvent::TouchCancel || event.touchesLength > 1) {
     m_suppressingTouchmovesWithinSlop = false;
@@ -292,6 +290,12 @@ WebInputEventResult TouchEventManager::dispatchTouchEvents(
     }
   }
 
+  // Do not suppress any touchmoves if the touchstart is consumed.
+  if (IsTouchSequenceStart(event) &&
+      eventResult == WebInputEventResult::NotHandled) {
+    m_suppressingTouchmovesWithinSlop = true;
+  }
+
   return eventResult;
 }