Update to Chromium //base at Chromium commit e3a753f17bac62738b0dbf0b36510f767b081e4b.

android/library_loader/library_prefetcher.cc

 // 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.
 
 #include "base/android/library_loader/library_prefetcher.h"
 
 #include <sys/resource.h>
 #include <sys/wait.h>
 #include <unistd.h>
 #include <utility>
@@ skipping 100 matching lines @@
       regions_to_prefetch.push_back(region);
     }
   }
 
   FilterLibchromeRangesOnlyIfPossible(regions_to_prefetch, ranges);
   return true;
 }
 
 // static
 bool NativeLibraryPrefetcher::ForkAndPrefetchNativeLibrary() {
+// Avoid forking with cygprofile instrumentation because the latter performs
+// memory allocations.
+#if defined(CYGPROFILE_INSTRUMENTATION)
+  return false;
+#endif
+
   // Looking for ranges is done before the fork, to avoid syscalls and/or memory
   // allocations in the forked process. The child process inherits the lock
   // state of its parent thread. It cannot rely on being able to acquire any
   // lock (unless special care is taken in a pre-fork handler), including being
   // able to call malloc().
   std::vector<AddressRange> ranges;
   if (!FindRanges(&ranges))
     return false;
+
   pid_t pid = fork();
   if (pid == 0) {
     setpriority(PRIO_PROCESS, 0, kBackgroundPriority);
     // _exit() doesn't call the atexit() handlers.
     _exit(Prefetch(ranges) ? 0 : 1);
   } else {
     if (pid < 0) {
       return false;
     }
     int status;
     const pid_t result = HANDLE_EINTR(waitpid(pid, &status, 0));
     if (result == pid) {
       if (WIFEXITED(status)) {
         return WEXITSTATUS(status) == 0;
       }
     }
     return false;
   }
 }
 
 }  // namespace android
 }  // namespace base