Simulate user inputs in wpt/touch-events/multi-touch-interactions.html

Use testdriver Action API to simulate touch actions in
third_party/blink/web_tests/external/wpt/touch-events/
multi-touch-interactions.html.

Bug: 1145677
Change-Id: Ia14e16d7f380d1c2cabc0e3ce8a1138a5255d8cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2702918
Commit-Queue: Lan Wei <lanwei@chromium.org>
Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#857806}

touch-events/multi-touch-interactions-manual.html → touch-events/multi-touch-interactions.html

@@ -19,6 +19,9 @@
 <meta name="viewport" content="width=device-width">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
 <script src="multi-touch-interactions.js"></script>
 <style>
     div {

touch-events/multi-touch-interactions.js

@@ -67,7 +67,7 @@ function check_starting_elements(list) {
     }
 }
 
-function run() {
+async function run() {
     var target0 = document.getElementById("target0");
     var target1 = document.getElementById("target1");
 
@@ -368,4 +368,23 @@ function run() {
             done();
         }
     });
+
+    await new test_driver.Actions()
+          .addPointer("touchPointer1", "touch")
+          .addPointer("touchPointer2", "touch")
+          .addPointer("touchPointer3", "touch")
+          .pointerMove(0, 0, {origin: target0, sourceName: "touchPointer1"})
+          .pointerMove(3, 0, {origin: target0, sourceName: "touchPointer2"})
+          .pointerDown({sourceName: "touchPointer1"})
+          .pointerDown({sourceName: "touchPointer2"})
+          .pointerMove(0, 10, {origin: target0, sourceName: "touchPointer1"})
+          .pointerMove(3, 10, {origin: target0, sourceName: "touchPointer2"})
+          .pointerMove(0, 0, {origin: target1, sourceName: "touchPointer1"})
+          .pointerMove(3, 0, {origin: target1, sourceName: "touchPointer2"})
+          .pointerMove(6, 0, {origin: target0, sourceName: "touchPointer3"})
+          .pointerDown({sourceName: "touchPointer3"})
+          .pointerUp({sourceName: "touchPointer1"})
+          .pointerUp({sourceName: "touchPointer2"})
+          .pointerUp({sourceName: "touchPointer3"})
+          .send();
 }