Fix use of uninitialized value in msan builds

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

Index: third_party/WebKit/Source/core/events/PointerEventFactory.h
diff --git a/third_party/WebKit/Source/core/events/PointerEventFactory.h b/third_party/WebKit/Source/core/events/PointerEventFactory.h
index 13a167a11980a8aed743a73ab266fafbdd48a049..1359d5b538ba5cf6a0624c0acb56aaed9b35a852 100644
--- a/third_party/WebKit/Source/core/events/PointerEventFactory.h
+++ b/third_party/WebKit/Source/core/events/PointerEventFactory.h
@@ -89,7 +89,9 @@ private:
     typedef struct PointerAttributes {
         IncomingId incomingId;
         bool isActiveButtons;
-        PointerAttributes() {}
+        PointerAttributes()
+        : incomingId()
+        , isActiveButtons(false) {}
         PointerAttributes(IncomingId incomingId, unsigned isActiveButtons)
         : incomingId(incomingId)
         , isActiveButtons(isActiveButtons) {}