Reset drag state variables on mouse up

third_party/WebKit/LayoutTests/fast/events/mouse-up-preventDefault-dragstate.html

+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+
+<style>
+#target {
+  width: 200px;
+  height: 200px;
+}
+</style>
+
+<p>This is the top level window.</p>
+<p>Click somewhere. Move the mouse into the iframe.</p>
+<p>Mouse move should be received by the iframe.</p>
+<iframe id="target" srcdoc="
+<p>This is the iframe.</p>
+<script>
+  document.addEventListener('mousemove', function() {
+    parent.mouseMoveReceived();
+  });
+</script>
+"></iframe>
+
+<script>
+var test_mousemove = async_test("Inner frame should receive mousemove even when mouseup preventDefault was called in the parent frame.");
+var mouseUpPrevented = 0;
+function mouseMoveReceived() {
+  if (mouseUpPrevented == 1)
+    test_mousemove.done();
+}
+document.addEventListener("mouseup", function(e) {
+  e.preventDefault();
+  mouseUpPrevented = 1;
+});
+
+function runTest() {
+  if (window.eventSender) {
+    var targetRect = document.getElementById("target").getBoundingClientRect();
+    eventSender.mouseMoveTo(targetRect.right+10, targetRect.bottom+10);
+    eventSender.mouseDown(0);
+    eventSender.mouseUp(0);
+    eventSender.mouseMoveTo(targetRect.right-10, targetRect.bottom-10);
+  }
+}
+window.onload = function() {
+  runTest();
+}
+</script>