Implement touch-action pan-x/pan-y handling on the main thread

Source/web/tests/TouchActionTest.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 244 matching lines @@
             if (expectedAction == "auto") {
                 // Auto is the default - no action set.
                 EXPECT_EQ(0, client.touchActionSetCount()) << failureContextPos;
                 EXPECT_EQ(WebTouchActionAuto, client.lastTouchAction()) << failureContextPos;
             } else {
                 // Should have received exactly one touch action.
                 EXPECT_EQ(1, client.touchActionSetCount()) << failureContextPos;
                 if (client.touchActionSetCount()) {
                     if (expectedAction == "none") {
                         EXPECT_EQ(WebTouchActionNone, client.lastTouchAction()) << failureContextPos;
+                    } else if (expectedAction == "pan-x") {
+                        EXPECT_EQ(WebTouchActionPanX, client.lastTouchAction()) << failureContextPos;
+                    } else if (expectedAction == "pan-y") {
+                        EXPECT_EQ(WebTouchActionPanY, client.lastTouchAction()) << failureContextPos;
+                    } else if (expectedAction == "pan-x-y") {
+                        EXPECT_EQ((WebTouchActionPanX | WebTouchActionPanY), client.lastTouchAction()) << failureContextPos;
                     } else {
                         FAIL() << "Unrecognized expected-action \"" << expectedAction.string().ascii().data()
                             << "\" " << failureContextPos;
                     }
                 }
             }
 
             // Reset webview touch state.
             client.reset();
             sendTouchEvent(webView, WebInputEvent::TouchCancel, clientPoint);
@@ skipping 31 matching lines @@
 TEST_F(TouchActionTest, Overflow)
 {
     runTouchActionTest("touch-action-overflow.html");
 }
 
 TEST_F(TouchActionTest, ShadowDOM)
 {
     runShadowDOMTest("touch-action-shadow-dom.html");
 }
 
+TEST_F(TouchActionTest, Pan)
+{
+    runTouchActionTest("touch-action-pan.html");
 }
+
+}