Fire pointermoves for mousemove events.

third_party/WebKit/Source/core/input/EventHandler.h

Index: third_party/WebKit/Source/core/input/EventHandler.h
diff --git a/third_party/WebKit/Source/core/input/EventHandler.h b/third_party/WebKit/Source/core/input/EventHandler.h
index 089241b3b866a1e52373d5e02b99cfc92d11622e..99c5a00b839547d4ed1e7c45421475c216759f35 100644
--- a/third_party/WebKit/Source/core/input/EventHandler.h
+++ b/third_party/WebKit/Source/core/input/EventHandler.h
@@ -291,6 +291,13 @@ private:
     MouseEventWithHitTestResults prepareMouseEvent(const HitTestRequest&, const PlatformMouseEvent&);
 
     bool dispatchMouseEvent(const AtomicString& eventType, Node* target, int clickCount, const PlatformMouseEvent&);
+
+    // Dispatches ME after corresponding PE provided the PE has not been canceled. The eventType arg
+    // must be a mouse event that can be gated though a preventDefaulted pointerdown (i.e., one of
+    // {mousedown, mousemove, mouseup}).
+    bool dispatchPointerAndMouseEvent(const AtomicString& mouseEventType, Node* target,
+        int clickCount, const PlatformMouseEvent&);

[Rick Byers, 2015/10/30 17:21:29]

PlatformMouseEvent contains a clickCount, can you eliminate the clickCount
argument?

[mustaq, 2015/11/03 20:44:30]

I think PlatformMouse event doesn't maintain the clickcount needed by UI
MouseEvent, specially on mouse release. EventHandler caches the last count in
m_clickCount, I guess this is the only reason.

[Rick Byers, 2015/11/03 20:59:56]

Ok.  Seems like a wart to me that might not be too hard to clean up somehow. 
Care to add a TODO?  At the very least the different semantics should be
documented in comments / argument names (maybe there's a distinction between the
pre-event-click-count and the post-event-click-count?).

[mustaq, 2015/11/03 21:37:34]

Added a TODO.

+
     bool dispatchDragEvent(const AtomicString& eventType, Node* target, const PlatformMouseEvent&, DataTransfer*);
 
     void clearDragDataTransfer();