ppapi: Add support for touch events.

ppapi/c/ppb_input_event.h

Index: ppapi/c/ppb_input_event.h
diff --git a/ppapi/c/ppb_input_event.h b/ppapi/c/ppb_input_event.h
index 2eb288c84029e09efbcbab35c7aebf6463a2249c..e74074324c9667dd08cada01d7ecca6de4a336bb 100644
--- a/ppapi/c/ppb_input_event.h
+++ b/ppapi/c/ppb_input_event.h
@@ -144,7 +144,31 @@ typedef enum {
    *
    * Register for this event using the PP_INPUTEVENT_CLASS_IME class.
    */
-  PP_INPUTEVENT_TYPE_IME_TEXT = 14
+  PP_INPUTEVENT_TYPE_IME_TEXT = 14,
+  /**
+   * Notification that a finger was placed on a touch-enabled device.
+   *
+   * Register for this event using the PP_INPUTEVENT_CLASS_TOUCH class.
+   */
+  PP_INPUTEVENT_TYPE_TOUCHSTART = 15,
+  /**
+   * Notification that a finger was moved on a touch-enabled device.
+   *
+   * Register for this event using the PP_INPUTEVENT_CLASS_TOUCH class.
+   */
+  PP_INPUTEVENT_TYPE_TOUCHMOVE = 16,
+  /**
+   * Notification that a finger was released on a touch-enabled device.
+   *
+   * Register for this event using the PP_INPUTEVENT_CLASS_TOUCH class.
+   */
+  PP_INPUTEVENT_TYPE_TOUCHEND = 17,
+  /**
+   * Notification that a touch event was canceled.
+   *
+   * Register for this event using the PP_INPUTEVENT_CLASS_TOUCH class.
+   */
+  PP_INPUTEVENT_TYPE_TOUCHCANCEL = 18
 } PP_InputEvent_Type;
 PP_COMPILE_ASSERT_SIZE_IN_BYTES(PP_InputEvent_Type, 4);