Propogate loading behavior data from Blink to content/

third_party/WebKit/public/platform/WebLoadingBehaviorFlag.h

Index: third_party/WebKit/public/platform/WebLoadingBehaviorFlag.h
diff --git a/third_party/WebKit/public/platform/WebLoadingBehaviorFlag.h b/third_party/WebKit/public/platform/WebLoadingBehaviorFlag.h
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+// Copyright 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.
+
+#ifndef WebLoadingBehaviorFlag_h
+#define WebLoadingBehaviorFlag_h
+
+namespace blink {
+
+// This enum tracks certain behavior Blink exhibits when loading a page. This is
+// for use in metrics collection by the loading team, to evaluate experimental
+// features and potential areas of improvement in the loading stack. The main
+// consumer is the page_load_metrics component, which sends bit flags to the
+// browser process for histogram splitting.
+enum WebLoadingBehaviorFlag {
+    WebLoadingBehaviorNone = 0,
+    WebLoadingBehaviorDocumentWriteEvaluator = 1 << 0,
+};
+
+} // namespace blink
+
+#endif // WebLoadingBehaviorFlag_h