The TRACE_LINK_IDS macro

base/trace_event/trace_event.cc

Index: base/trace_event/trace_event.cc
diff --git a/base/trace_event/trace_event.cc b/base/trace_event/trace_event.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0ea34e37637b8b2db311742262f6e468163d0b28
--- /dev/null
+++ b/base/trace_event/trace_event.cc
@@ -0,0 +1,47 @@
+// Copyright (c) 2016 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 "base/trace_event/trace_event.h"
+
+#include "base/format_macros.h"
+#include "base/memory/ptr_util.h"
+#include "base/strings/stringprintf.h"
+#include "base/trace_event/trace_event_argument.h"
+
+namespace trace_event_internal {
+
+std::unique_ptr<base::trace_event::ConvertableToTraceFormat>
+TraceID::dict_value() const {
+  auto value = base::MakeUnique<base::trace_event::TracedValue>();
+
+  if (scope_ != kGlobalScope)
+    value->SetString("scope", scope_);
+  switch (id_flags_) {
+    case TRACE_EVENT_FLAG_HAS_ID:
+      value->SetString(
+          "id",
+          base::StringPrintf("0x%" PRIx64, static_cast<uint64_t>(raw_id_)));
+      break;
+    case TRACE_EVENT_FLAG_HAS_GLOBAL_ID:
+      value->BeginDictionary("id2");
+      value->SetString(
+          "global",
+          base::StringPrintf("0x%" PRIx64, static_cast<uint64_t>(raw_id_)));
+      value->EndDictionary();
+      break;
+    case TRACE_EVENT_FLAG_HAS_LOCAL_ID:
+      value->BeginDictionary("id2");
+      value->SetString(
+          "local",
+          base::StringPrintf("0x%" PRIx64, static_cast<uint64_t>(raw_id_)));
+      value->EndDictionary();
+      break;
+    default:
+      NOTREACHED() << "Unrecognized ID flag";
+  }
+
+  return std::move(value);
+}
+
+}  // namespace trace_event_internal