Reland: Handle long press in PDF documents.

chrome/test/data/pdf/touch_handling_test.js

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function sendTouchStart(touches) {
+  var id = 0;
+  let touchList = touches.map(function(xy) {
+    var touchInit = {
+      identifier: id++,
+      target: viewer.plugin_,
+      clientX: xy.x,
+      clientY: xy.y,
+    };
+
+    return new window.Touch(touchInit);
+  });
+
+  viewer.plugin_.dispatchEvent(new TouchEvent('touchstart', {
+    touches: touchList,
+    targetTouches: touchList,
+    changedtouches: touchList
+  }));
+}
+
+function createContextMenuEvent() {
+  return new MouseEvent('contextmenu', {
+    cancelable: true,
+    sourceCapabilities: new InputDeviceCapabilities({firesTouchEvents: true})
+  });
+}
+
+var tests = [
+  // Test suppression of the context menu on single touch.
+  function testContextMenuSingleTouch() {
+    sendTouchStart([{x: 10, y: 10}]);
+
+    let event = createContextMenuEvent();
+    // Dispatch event will be false if the event is cancellable and one of the
+    // handlers called preventDefault.
+    chrome.test.assertFalse(document.dispatchEvent(event),
+        "Should have called preventDefault() for single touch.");
+    chrome.test.succeed();
+  },
+
+  // Test allowing of context menu on double touch.
+  function testContextMenuDoubleTouch() {
+    sendTouchStart([{x: 10, y: 10}, {x: 15, y: 15}]);
+
+    let event = createContextMenuEvent();
+    chrome.test.assertTrue(document.dispatchEvent(event),
+        "Should not have called preventDefault() for double touch.");
+    chrome.test.succeed();
+  },
+
+  // Test long press selects word. This test flakes out on some bots.
+  // The test passes locally on MacOS, ChromeOS and Linux. Disable until it's
+  // possible to repro the bot issue. https://crbug.com/723632
+  // function testLongPressSelectsText() {
+  //   var client = new PDFScriptingAPI(window, window);
+  //   sendTouchStart([{x: 336, y: 163}]);
+  //   window.setTimeout(function() {
+  //     client.getSelectedText(
+  //       chrome.test.callbackPass(function(selectedText) {
+  //         chrome.test.assertEq('some', selectedText);
+  //       })
+  //     );
+  //     chrome.test.succeed();
+  //   // 10k is the value for the action_timeout_ms_ in Chrome test_timeouts.cc
+  //   }, 10000);
+  // }
+];
+
+var scriptingAPI = new PDFScriptingAPI(window, window);
+scriptingAPI.setLoadCallback(function() {
+  chrome.test.runTests(tests);
+});