Move Navigation.MainFrameScheme UMA recording to //components.

components/navigation_metrics/navigation_metrics.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 "components/navigation_metrics/navigation_metrics.h"
+
+#include "base/metrics/histogram.h"
+
+namespace {
+
+enum Scheme {
+  SCHEME_UNKNOWN,
+  SCHEME_HTTP,
+  SCHEME_HTTPS,
+  SCHEME_FILE,
+  SCHEME_FTP,
+  SCHEME_DATA,
+  SCHEME_JAVASCRIPT,
+  SCHEME_ABOUT,
+  SCHEME_CHROME,
+  SCHEME_MAX,
+};
+
+static const char* kSchemeNames[] = {
+  "unknown",
+  "http",
+  "https",
+  "file",
+  "ftp",
+  "data",
+  "javascript",
+  "about",
+  "chrome",
+  "max",
+};
+
+COMPILE_ASSERT(arraysize(kSchemeNames) == SCHEME_MAX + 1,
+               NavigationMetricsRecorder_name_count_mismatch);
+
+}  // namespace
+
+namespace navigation_metrics {
+
+void RecordMainFrameNavigation(const GURL& url) {
+  Scheme scheme = SCHEME_UNKNOWN;
+  for (int i = 1; i < SCHEME_MAX; ++i) {
+    if (url.SchemeIs(kSchemeNames[i])) {
+      scheme = static_cast<Scheme>(i);
+      break;
+    }
+  }
+  UMA_HISTOGRAM_ENUMERATION(
+      "Navigation.MainFrameScheme", scheme, SCHEME_MAX);
+}
+
+}  // namespace navigation_metrics