Add crash keys about field trial shared memory errors.

base/memory/shared_memory_posix.cc

 // 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.
 
 #include "base/memory/shared_memory.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <sys/mman.h>
@@ skipping 95 matching lines @@
   // the temporary files we create will just go into the buffer cache
   // and be deleted before they ever make it out to disk.
   base::ThreadRestrictions::ScopedAllowIO allow_io;
 
   ScopedFILE fp;
   bool fix_size = true;
   ScopedFD readonly_fd;
 
   FilePath path;
   if (options.name_deprecated == NULL || options.name_deprecated->empty()) {
-    bool result =
-        CreateAnonymousSharedMemory(options, &fp, &readonly_fd, &path);
+    bool result = CreateAnonymousSharedMemory(options, &fp, &readonly_fd, &path,
+                                              &last_error_);
     if (!result)
       return false;
   } else {
     if (!FilePathForMemoryName(*options.name_deprecated, &path))
       return false;
 
     // Make sure that the file is opened without any permission
     // to other users on the system.
     const mode_t kOwnerOnly = S_IRUSR | S_IWUSR;
 
@@ skipping 70 matching lines @@
       if (dir.value() == "/dev/shm") {
         LOG(FATAL) << "This is frequently caused by incorrect permissions on "
                    << "/dev/shm.  Try 'sudo chmod 1777 /dev/shm' to fix.";
       }
     }
     return false;
   }
 
   int mapped_file = -1;
   int readonly_mapped_file = -1;
-  bool result = PrepareMapFile(std::move(fp), std::move(readonly_fd),
-                               &mapped_file, &readonly_mapped_file);
+  bool result =
+      PrepareMapFile(std::move(fp), std::move(readonly_fd), &mapped_file,
+                     &readonly_mapped_file, &last_error_);
   shm_ = SharedMemoryHandle(base::FileDescriptor(mapped_file, false),
                             UnguessableToken::Create());
   readonly_shm_ = SharedMemoryHandle(
       base::FileDescriptor(readonly_mapped_file, false), shm_.GetGUID());
   return result;
 }
 
 // Our current implementation of shmem is with mmap()ing of files.
 // These files need to be deleted explicitly.
 // In practice this call is only needed for unit tests.
@@ skipping 18 matching lines @@
 
   const char *mode = read_only ? "r" : "r+";
   ScopedFILE fp(base::OpenFile(path, mode));
   ScopedFD readonly_fd(HANDLE_EINTR(open(path.value().c_str(), O_RDONLY)));
   if (!readonly_fd.is_valid()) {
     DPLOG(ERROR) << "open(\"" << path.value() << "\", O_RDONLY) failed";
     return false;
   }
   int mapped_file = -1;
   int readonly_mapped_file = -1;
-  bool result = PrepareMapFile(std::move(fp), std::move(readonly_fd),
-                               &mapped_file, &readonly_mapped_file);
+  bool result =
+      PrepareMapFile(std::move(fp), std::move(readonly_fd), &mapped_file,
+                     &readonly_mapped_file, &last_error_);
   // This form of sharing shared memory is deprecated. https://crbug.com/345734.
   // However, we can't get rid of it without a significant refactor because its
   // used to communicate between two versions of the same service process, very
   // early in the life cycle.
   // Technically, we should also pass the GUID from the original shared memory
   // region. We don't do that - this means that we will overcount this memory,
   // which thankfully isn't relevant since Chrome only communicates with a
   // single version of the service process.
   shm_ = SharedMemoryHandle(base::FileDescriptor(mapped_file, false),
                             UnguessableToken::Create());
@@ skipping 120 matching lines @@
   struct stat file_stat;
   if (HANDLE_EINTR(
           ::fstat(static_cast<int>(handle().GetHandle()), &file_stat)) != 0)
     return false;
   id->first = file_stat.st_dev;
   id->second = file_stat.st_ino;
   return true;
 }
 
 }  // namespace base