Implement install module verification metric.

chrome/browser/install_module_verifier_win.h

Index: chrome/browser/install_module_verifier_win.h
diff --git a/chrome/browser/install_module_verifier_win.h b/chrome/browser/install_module_verifier_win.h
new file mode 100644
index 0000000000000000000000000000000000000000..3ce88cfb04f4f0e5441f5607c7c54e1e9205d278
--- /dev/null
+++ b/chrome/browser/install_module_verifier_win.h
@@ -0,0 +1,48 @@
+// 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.
+
+#ifndef CHROME_BROWSER_INSTALL_MODULE_VERIFIER_WIN_H_
+#define CHROME_BROWSER_INSTALL_MODULE_VERIFIER_WIN_H_
+
+#include <set>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "base/strings/string_piece.h"
+
+namespace base {
+class ListValue;
+}  // namespace base
+
+typedef std::vector<std::pair<size_t, base::StringPiece> > AdditionalModules;
+
+// Starts a background process to verify installed modules. Results are reported
+// via UMA.
+void BeginModuleVerification();
+
+// Converts a list of modules descriptions extracted from EnumerateModulesModel
+// into a list of loaded module name digests.
+void ExtractLoadedModuleNameDigests(
+    const base::ListValue& module_list,
+    std::set<std::string>* loaded_module_name_digests);
+
+// Verifies a list of installed module name digests and inserts installed module
+// IDs into the supplied set.
+void VerifyModules(const std::set<std::string>& module_name_digests,
+                   const AdditionalModules& additional_modules,
+                   std::set<size_t>* installed_module_ids);
+
+// Parses a list of additional modules to verify. The data format is a series of
+// lines. Each line starts with a decimal ID, then a module name digest,
+// separated by a space. Lines are terminated by \r and/or \n. The result is a
+// vector of pairs where the first value is an ID and the second value is the
+// corresponding module name digest. The StringPieces use the same underlying
+// storage as |raw_data|.
+//
+// Invalid lines are ignored.
+void ParseAdditionalModules(const base::StringPiece& raw_data,
+                            AdditionalModules* additional_modules);
+
+#endif  // CHROME_BROWSER_INSTALL_MODULE_VERIFIER_WIN_H_