Add events with custom timestamps and thread id to PPAPI dev tracing interface.

ppapi/shared_impl/ppb_trace_event_impl.h

 // 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.
 
 #ifndef PPAPI_SHARED_IMPL_PPB_TRACE_EVENT_IMPL_H_
 #define PPAPI_SHARED_IMPL_PPB_TRACE_EVENT_IMPL_H_
 
 #include "ppapi/c/dev/ppb_trace_event_dev.h"
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
 
 namespace ppapi {
 
 // Contains the implementation of the PPB_Trace_Event_Dev functions. Since these
 // functions are to be run from whatever plugin process/thread in which they
 // originated, the implementation lives in shared_impl.
 //
 class PPAPI_SHARED_EXPORT TraceEventImpl {
  public:
   static void* GetCategoryEnabled(const char* category_name);
-  static void AddTraceEvent(int8_t phase,
-                               const void* category_enabled,
-                               const char* name,
-                               uint64_t id,
-                               uint32_t num_args,
-                               const char* arg_names[],
-                               const uint8_t arg_types[],
-                               const uint64_t arg_values[],
-                               uint8_t flags);
+  static void AddTraceEvent(
+      int8_t phase,
+      const void* category_enabled,
+      const char* name,
+      uint64_t id,
+      uint32_t num_args,
+      const char* arg_names[],
+      const uint8_t arg_types[],
+      const uint64_t arg_values[],
+      uint8_t flags);
+  static void AddTraceEventWithThreadIdAndTimestamp(
+      int8_t phase,
+      const void* category_enabled,
+      const char* name,
+      uint64_t id,
+      int32_t thread_id,
+      int64_t timestamp,
+      uint32_t num_args,
+      const char* arg_names[],
+      const uint8_t arg_types[],
+      const uint64_t arg_values[],
+      uint8_t flags);
+  static int64_t Now();
   static void SetThreadName(const char* thread_name);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_PPB_TRACE_EVENT_IMPL_H_