Add sandbox support for AsanCoverage.

content/zygote/zygote_linux.h

 // Copyright (c) 2012 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 CONTENT_ZYGOTE_ZYGOTE_H_
 #define CONTENT_ZYGOTE_ZYGOTE_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 10 matching lines @@
 
 namespace content {
 
 class ZygoteForkDelegate;
 
 // This is the object which implements the zygote. The ZygoteMain function,
 // which is called from ChromeMain, simply constructs one of these objects and
 // runs it.
 class Zygote {
  public:
-  Zygote(int sandbox_flags, ScopedVector<ZygoteForkDelegate> helpers);
+  Zygote(int sandbox_flags, ScopedVector<ZygoteForkDelegate> helpers,
+         const std::vector<base::ProcessHandle>& extra_children,
+         const std::vector<int>& extra_fds);
   ~Zygote();
 
   bool ProcessRequests();
 
  private:
   struct ZygoteProcessInfo {
     // Pid from inside the Zygote's PID namespace.
     base::ProcessHandle internal_pid;
     // Keeps track of which fork delegate helper the process was started from.
     ZygoteForkDelegate* started_from_helper;
@@ skipping 74 matching lines @@
   // notably what the PID of the process is inside the PID namespace of
   // the Zygote and whether or not a process was started by the
   // ZygoteForkDelegate helper.
   ZygoteProcessMap process_info_map_;
 
   const int sandbox_flags_;
   ScopedVector<ZygoteForkDelegate> helpers_;
 
   // Count of how many fork delegates for which we've invoked InitialUMA().
   size_t initial_uma_index_;
+
+  // This vector contains the PIDs of any child processes which have been
+  // created prior to the construction of the Zygote object, and must be reaped
+  // before the Zygote exits.

[jln (very slow on Chromium), 2014/05/27 23:15:00]

Let's add more documentation:

"The Zygote will perform a blocking wait on these children, so they must be
guaranteed to be exiting by the time the Zygote exits.".

[earthdok, 2014/05/28 16:44:51]

Done.

+  std::vector<base::ProcessHandle> extra_children_;
+
+  // This vector contains the FDs that must be closed before reaping the extra
+  // children.
+  std::vector<int> extra_fds_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_ZYGOTE_ZYGOTE_H_