Add C++ Trace Event support to PPAPI/NaCl SDK

ppapi/cpp/dev/trace_event_dev.cc

+// Copyright (c) 2013 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/cpp/dev/trace_event_dev.h"
+
+#include "ppapi/c/dev/ppb_trace_event_dev.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/module_impl.h"
+
+namespace pp {
+
+namespace {
+
+template <> const char* interface_name<PPB_Trace_Event_Dev>() {
+  return PPB_TRACE_EVENT_DEV_INTERFACE_0_1;
+}
+
+}  // namespace
+
+namespace trace_events {
+
+const unsigned char* GetCategoryEnabled(const char* category_name) {
+  // This casting is due to limitations in PPAPI. It is unable to return
+  // a const pointer, and all pointer return types are necessarily void*.
+  return reinterpret_cast<const unsigned char*>(
+      get_interface<PPB_Trace_Event_Dev>()->GetCategoryEnabled(category_name));
+}
+
+void AddTraceEvent(char phase,
+                   const unsigned char* category_enabled,
+                   const char* name,
+                   unsigned long long id,
+                   int num_args,
+                   const char** arg_names,
+                   const unsigned char* arg_types,
+                   const uint64_t* arg_values,
+                   unsigned char flags) {
+  // This casting is due to limitations in PPAPI. 'in' parameters of type mem_t
+  // in the IDL are always const void*.
+  get_interface<PPB_Trace_Event_Dev>()->AddTraceEvent(phase,
+      reinterpret_cast<const void*>(category_enabled), name, id, num_args,
+      arg_names, arg_types, arg_values, flags);
+}
+
+void SetThreadName(const char* thread_name) {
+  get_interface<PPB_Trace_Event_Dev>()->SetThreadName(thread_name);
+}
+
+
+}  // namespace trace_events
+
+}  // namespace pp