Add support for Flash Player Component updates on Linux

chrome/common/component_flash_hint_file_linux.h

+// 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_LINUX_H_
+#define CHROME_COMMON_COMPONENT_FLASH_HINT_FILE_LINUX_H_
+
+#include "build/build_config.h"
+
+#if defined(OS_LINUX)
+
+#include <string>
+
+namespace base {
+class FilePath;
+}
+
+namespace chrome {

[Lei Zhang, 2015/08/14 22:37:07]

We actually decided to stop using the chrome namespace a few years ago. Please
do not add more.

[Greg K, 2015/08/17 21:11:57]

Done.

+
+// 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 component_flash_hint_file {
+
+// 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 component_flash_hint_file
+
+}  // namespace chrome
+
+#endif  // defined(OS_LINUX)
+#endif  // CHROME_COMMON_COMPONENT_FLASH_HINT_FILE_LINUX_H_