Add support for Flash Player Component updates on Linux

chrome/common/component_flash_hint_file.h

Index: chrome/common/component_flash_hint_file.h
diff --git a/chrome/common/component_flash_hint_file.h b/chrome/common/component_flash_hint_file.h
new file mode 100644
index 0000000000000000000000000000000000000000..b78c2533111838c01e84e780e79e8a3a61e8d259
--- /dev/null
+++ b/chrome/common/component_flash_hint_file.h
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+// Copyright 2015 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_COMMON_COMPONENT_FLASH_HINT_FILE_H_
+#define CHROME_COMMON_COMPONENT_FLASH_HINT_FILE_H_
+
+#include <string>
+#include <vector>
+
+#include "base/files/file_util.h"
+#include "crypto/secure_hash.h"
+
+namespace chrome {
+
+// The APIs in this namespace wraps the component updated flash hint file, which
+// lives inside the PepperFlash folder of  the user-data-dir, so that the Linux
+// zygote process can preload the right version of flash.
+namespace ComponentFlashHintFile {
+
+// Records a new flash update into the hint file.
+// |unpacked_plugin| is the current location of the plugin.
+// |moved_plugin| is the location where the plugin will be loaded from.
+bool RecordFlashUpdate(const base::FilePath& unpacked_plugin,
+                       const base::FilePath& moved_plugin,
+                       const std::string& version);
+
+// Reports whether or not a hints file exists.
+bool DoesHintFileExist();
+
+// Return the path of the component updated flash plugin, only if the file has
+// the correct hash sum.
+// |path| will be populated with the path to the flash plugin.
+// |version| will be populated with the version of the flash plugin.
+bool VerifyAndReturnFlashLocation(base::FilePath* path, std::string* version);
+
+// Test if the specified plugin file can be mapped executable.
+// This is useful to test if the flash plugin is in a directory mounted
+// noexec, in which case Chrome will not be able to load and use the plugin.
+// |path| is the path of the flash plugin that will mapped executable.
+bool TestExecutableMapping(const base::FilePath& path);
+
+}  // namespace ComponentFlashHintFile
+
+}  // namespace chrome
+
+#endif  // CHROME_COMMON_COMPONENT_FLASH_HINT_FILE_H_