Added prerendering to omnibox.

chrome/browser/prerender/prerender_origin.cc

+// Copyright (c) 2011 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 "chrome/browser/prerender/prerender_origin.h"
+
+#include "base/metrics/histogram.h"
+#include "chrome/browser/prerender/prerender_manager.h"
+
+namespace prerender {
+
+namespace {
+
+const char* kOriginNames[] = {
+  "Link Rel Prerender",
+  "Omnibox",
+  "Max"
+};
+COMPILE_ASSERT(arraysize(kOriginNames) == ORIGIN_MAX + 1,
+               PrerenderOrigin_name_count_mismatch);
+
+}
+
+const char* NameFromOrigin(Origin origin) {
+  DCHECK(static_cast<int>(origin) >= 0 &&
+         origin <= ORIGIN_MAX);
+  return kOriginNames[origin];
+}
+
+}  // namespace prerender