ppapi: Add support for touch events.

ppapi/thunk/ppb_input_event_api.h

Index: ppapi/thunk/ppb_input_event_api.h
diff --git a/ppapi/thunk/ppb_input_event_api.h b/ppapi/thunk/ppb_input_event_api.h
index eda6b8e981ff55396fef587ed4143227af101100..efedb6aaa5ec71bc8e9a5b0e2a5cf1bb1b38b9bf 100644
--- a/ppapi/thunk/ppb_input_event_api.h
+++ b/ppapi/thunk/ppb_input_event_api.h
@@ -7,6 +7,7 @@
 
 #include "ppapi/c/dev/ppb_ime_input_event_dev.h"
 #include "ppapi/c/dev/ppb_keyboard_input_event_dev.h"
+#include "ppapi/c/dev/ppb_touch_event_dev.h"
 #include "ppapi/c/ppb_input_event.h"
 #include "ppapi/thunk/ppapi_thunk_export.h"
 
@@ -42,6 +43,11 @@ class PPAPI_THUNK_EXPORT PPB_InputEvent_API {
   virtual uint32_t GetIMESegmentOffset(uint32_t index) = 0;
   virtual int32_t GetIMETargetSegment() = 0;
   virtual void GetIMESelection(uint32_t* start, uint32_t* end) = 0;
+  virtual uint32_t GetTouchCount(PP_TouchListType list) = 0;
+  virtual PP_TouchPoint_Dev GetTouchByIndex(PP_TouchListType list,
+                                            uint32_t index) = 0;
+  virtual PP_TouchPoint_Dev GetTouchById(PP_TouchListType list,
+                                         uint32_t id) = 0;
 };
 
 }  // namespace thunk