add missing headers in ppapi/*

ppapi/shared_impl/ppb_trace_event_impl.cc

 // 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.
 
 #include "ppapi/shared_impl/ppb_trace_event_impl.h"
 
 #include "base/basictypes.h"
 #include "base/debug/trace_event.h"
+#include "base/threading/platform_thread.h"
 #include "ppapi/thunk/thunk.h"
 
 
 namespace ppapi {
 
 // PPB_Trace_Event_Dev is a shared implementation because Trace Events can be
 // sent from either the plugin process or renderer process depending on whether
 // the plugin is in- or out-of-process.  Also, for NaCl plugins these functions
 // will be executed from untrusted code and handled appropriately by tracing
 // functionality in the IRT.
@@ skipping 95 matching lines @@
 const PPB_Trace_Event_Dev_0_1* GetPPB_Trace_Event_Dev_0_1_Thunk() {
   return &g_ppb_trace_event_thunk_0_1;
 }
 
 const PPB_Trace_Event_Dev_0_2* GetPPB_Trace_Event_Dev_0_2_Thunk() {
   return &g_ppb_trace_event_thunk_0_2;
 }
 
 }  // namespace thunk
 }  // namespace ppapi