Added PointerEvent firing on touch events.

LayoutTests/fast/events/pointerevents/touch-pointer-events-expected.txt

+CONSOLE ERROR: line 109: Uncaught TypeError: Cannot read property 'pointerId' of undefined
+Verifies that tapping on an element fires appropriate pointer events.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+--- test PE+TE event sequences without preventDefault ---
+green received touchstart at phase=target
+lightgreen received touchstart at phase=bubbling
+grey received touchstart at phase=bubbling
+green received touchmove at phase=target
+lightgreen received touchmove at phase=bubbling
+grey received touchmove at phase=bubbling
+green received touchend at phase=target
+lightgreen received touchend at phase=bubbling
+grey received touchend at phase=bubbling
+
+--- test PE+TE event sequences with PE preventDefault ---
+green received touchstart at phase=target
+lightgreen received touchstart at phase=bubbling
+grey received touchstart at phase=bubbling
+green received touchmove at phase=target
+lightgreen received touchmove at phase=bubbling
+grey received touchmove at phase=bubbling
+green received touchend at phase=target
+lightgreen received touchend at phase=bubbling
+grey received touchend at phase=bubbling
+
+--- test PE params for single-touch ---
+FAIL receivedPEsAtTarget[0].isPrimary should be true. Threw exception TypeError: Cannot read property 'isPrimary' of undefined
+FAIL receivedPEsAtTarget[0].button should be 0. Threw exception TypeError: Cannot read property 'button' of undefined
+FAIL receivedPEsAtTarget[0].buttons should be 1. Threw exception TypeError: Cannot read property 'buttons' of undefined
+FAIL receivedPEsAtTarget[0].clientX should be 148. Threw exception TypeError: Cannot read property 'clientX' of undefined
+FAIL receivedPEsAtTarget[0].clientY should be 156. Threw exception TypeError: Cannot read property 'clientY' of undefined
+FAIL receivedPEsAtTarget[1].isPrimary should be true. Threw exception TypeError: Cannot read property 'isPrimary' of undefined
+FAIL receivedPEsAtTarget[1].button should be 0. Threw exception TypeError: Cannot read property 'button' of undefined
+FAIL receivedPEsAtTarget[1].buttons should be 1. Threw exception TypeError: Cannot read property 'buttons' of undefined
+FAIL receivedPEsAtTarget[1].clientX should be 168. Threw exception TypeError: Cannot read property 'clientX' of undefined
+FAIL receivedPEsAtTarget[1].clientY should be 176. Threw exception TypeError: Cannot read property 'clientY' of undefined
+FAIL receivedPEsAtTarget[2].isPrimary should be true. Threw exception TypeError: Cannot read property 'isPrimary' of undefined
+FAIL receivedPEsAtTarget[2].button should be 0. Threw exception TypeError: Cannot read property 'button' of undefined
+FAIL receivedPEsAtTarget[2].buttons should be 0. Threw exception TypeError: Cannot read property 'buttons' of undefined
+FAIL receivedPEsAtTarget.length should be 3. Was 0.
+
+--- test PE isPrimary values ---
+FAIL receivedPEsAtTarget[0].isPrimary should be true. Threw exception TypeError: Cannot read property 'isPrimary' of undefined
+FAIL successfullyParsed should be true. Was false.
+
+TEST COMPLETE
+