Collect some histograms about signed binary downloads.

chrome/browser/safe_browsing/signature_util.h

Index: chrome/browser/safe_browsing/signature_util.h
diff --git a/chrome/browser/safe_browsing/signature_util.h b/chrome/browser/safe_browsing/signature_util.h
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+// 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.
+//
+// Utility functions to check executable signatures for malicious binary
+// detection.  Each platform has its own implementation of this class.
+
+#ifndef CHROME_BROWSER_SAFE_BROWSING_SIGNATURE_UTIL_H_
+#define CHROME_BROWSER_SAFE_BROWSING_SIGNATURE_UTIL_H_
+#pragma once
+
+class FilePath;
+
+namespace safe_browsing {
+namespace signature_util {
+
+// Returns true if the given file path contains a signature.  No checks are
+// performed as to the validity of the signature.
+bool IsSigned(const FilePath& file_path);
+
+}  // namespace signature_util
+}  // namespace safe_browsing
+
+#endif  // CHROME_BROWSER_SAFE_BROWSING_SIGNATURE_UTIL_H_