Reland of http://crrev.com/241548.

chrome_elf/blacklist/blacklist.h

Index: chrome_elf/blacklist/blacklist.h
diff --git a/chrome_elf/blacklist/blacklist.h b/chrome_elf/blacklist/blacklist.h
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+// Copyright 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_ELF_BLACKLIST_BLACKLIST_H_
+#define CHROME_ELF_BLACKLIST_BLACKLIST_H_
+
+namespace blacklist {
+
+// Max size of the DLL blacklist.
+const int kTroublesomeDllsMaxCount = 64;
+
+// The DLL blacklist.
+extern const wchar_t* g_troublesome_dlls[kTroublesomeDllsMaxCount];
+
+// Cursor to the current last element in the blacklist.
+extern int g_troublesome_dlls_cur_index;
+
+// The registry path of the blacklist beacon. Exposed here for testing.
+extern const wchar_t kRegistryBeaconPath[];
+
+// Attempts to create a beacon in the current user's registry hive.
+// If the beacon already exists or any other error occurs when creating the
+// beacon, returns false. Otherwise returns true.
+// The intent of the beacon is to act as an extra failure mode protection
+// whereby if Chrome for some reason fails to start during blacklist setup,
+// it will skip blacklisting on the subsequent run.
+bool CreateBeacon();
+
+// Looks for the beacon that CreateBeacon() creates and attempts to delete it.
+// Returns true if the beacon was found and deleted.
+bool ClearBeacon();
+
+// Adds the given dll name to the blacklist. Returns true if the dll name is in
+// the blacklist when this returns, false on error. Note that this will copy
+// |dll_name| and will leak it on exit if the string is not subsequently removed
+// using RemoveDllFromBlacklist.
+extern "C" bool AddDllToBlacklist(const wchar_t* dll_name);
+
+// Removes the given dll name from the blacklist. Returns true if it was
+// removed, false on error.
+extern "C" bool RemoveDllFromBlacklist(const wchar_t* dll_name);
+
+// Initializes the DLL blacklist in the current process. This should be called
+// before any undesirable DLLs might be loaded. If |force| is set to true, then
+// initialization will take place even if a beacon is present. This is useful
+// for tests.
+bool Initialize(bool force);
+
+}  // namespace blacklist
+
+#endif  // CHROME_ELF_BLACKLIST_BLACKLIST_H_