Support Coalesced Touch in ppapi

ppapi/api/ppb_input_event.idl

 /* Copyright (c) 2012 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.
  */
 
 /**
  * This file defines the Input Event interfaces.
  */
 
 label Chrome {
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    * touch-end. If the plugin does register for touch events, then the synthetic
    * mouse events are not created.
    */
   PP_INPUTEVENT_CLASS_TOUCH = 1 << 3,
 
   /**
    * Identifies IME composition input events.
    *
    * Request this input event class if you allow on-the-spot IME input.
    */
-  PP_INPUTEVENT_CLASS_IME = 1 << 4
+  PP_INPUTEVENT_CLASS_IME = 1 << 4,
+
+  /**
+  * Identifies coalesced touch input events.
+  *
+  * Touch events are coalesced for each frame. By default, the coalesced touch
+  * events will be dropped. Request this input event class if you intend to
+  * handle all the touch events.
+  */
+  PP_INPUTEVENT_CLASS_COALESCED_TOUCH = 1 << 5
 };
 
 /**
  * The <code>PPB_InputEvent</code> interface contains pointers to several
  * functions related to generic input events on the browser.
  */
 [version=1.0, macro="PPB_INPUT_EVENT_INTERFACE"]
 interface PPB_InputEvent {
   /**
    * RequestInputEvent() requests that input events corresponding to the given
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    * event.
    *
    * @param[out] start The start position of the current selection.
    *
    * @param[out] end The end position of the current selection.
    */
   void GetSelection([in] PP_Resource ime_event,
                     [out] uint32_t start,
                     [out] uint32_t end);
 };