DevTools: Move network request instrumentation points for timeline down the stack.

third_party/WebKit/Source/platform/instrumentation/inspector/PlatformIdentifiersFactory.cpp

Index: third_party/WebKit/Source/platform/instrumentation/inspector/PlatformIdentifiersFactory.cpp
diff --git a/third_party/WebKit/Source/platform/instrumentation/inspector/PlatformIdentifiersFactory.cpp b/third_party/WebKit/Source/platform/instrumentation/inspector/PlatformIdentifiersFactory.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..4d5daf95cc5e59b3ea90fc2631f88b4d8b7a8073
--- /dev/null
+++ b/third_party/WebKit/Source/platform/instrumentation/inspector/PlatformIdentifiersFactory.cpp
@@ -0,0 +1,57 @@
+// Copyright 2017 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 "platform/instrumentation/inspector/PlatformIdentifiersFactory.h"
+
+#include "public/platform/Platform.h"
+#include "wtf/Assertions.h"
+#include "wtf/text/StringBuilder.h"
+
+namespace blink {
+
+namespace {
+
+volatile int s_lastUsedIdentifier = 0;
+
+}  // namespace
+
+// static
+String PlatformIdentifiersFactory::createIdentifier() {
+  int identifier = atomicIncrement(&s_lastUsedIdentifier);
+  return addProcessIdPrefixTo(identifier);
+}
+
+// static
+String PlatformIdentifiersFactory::requestId(unsigned long identifier) {
+  return identifier ? addProcessIdPrefixTo(identifier) : String();
+}
+
+// static
+String PlatformIdentifiersFactory::addProcessIdPrefixTo(int id) {
+  DEFINE_THREAD_SAFE_STATIC_LOCAL(
+      uint32_t, s_processId,
+      new uint32_t(Platform::current()->getUniqueIdForProcess()));
+
+  StringBuilder builder;
+
+  builder.appendNumber(s_processId);
+  builder.append('.');
+  builder.appendNumber(id);
+
+  return builder.toString();
+}
+
+// static
+int PlatformIdentifiersFactory::removeProcessIdPrefixFrom(const String& id,
+                                                          bool* ok) {
+  size_t dotIndex = id.find('.');
+
+  if (dotIndex == kNotFound) {
+    *ok = false;
+    return 0;
+  }
+  return id.substring(dotIndex + 1).toInt(ok);
+}
+
+}  // namespace blink