Update from https://crrev.com/333737

third_party/android_crazy_linker/src/src/crazy_linker_system.cpp

Index: third_party/android_crazy_linker/src/src/crazy_linker_system.cpp
diff --git a/third_party/android_crazy_linker/src/src/crazy_linker_system.cpp b/third_party/android_crazy_linker/src/src/crazy_linker_system.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d2f0734f2a44a31567e97b38685e9aea2e747d36
--- /dev/null
+++ b/third_party/android_crazy_linker/src/src/crazy_linker_system.cpp
@@ -0,0 +1,90 @@
+// Copyright 2014 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 "crazy_linker_system.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "crazy_linker_util.h"
+
+// Note: unit-testing support files are in crazy_linker_files_mock.cpp
+
+namespace crazy {
+
+#ifndef UNIT_TESTS
+
+bool FileDescriptor::OpenReadOnly(const char* path) {
+  Close();
+  fd_ = TEMP_FAILURE_RETRY(::open(path, O_RDONLY));
+  return (fd_ != -1);
+}
+
+bool FileDescriptor::OpenReadWrite(const char* path) {
+  Close();
+  fd_ = TEMP_FAILURE_RETRY(::open(path, O_RDWR));
+  return (fd_ != -1);
+}
+
+int FileDescriptor::Read(void* buffer, size_t buffer_size) {
+  return TEMP_FAILURE_RETRY(::read(fd_, buffer, buffer_size));
+}
+
+int FileDescriptor::SeekTo(off_t offset) {
+  return ::lseek(fd_, offset, SEEK_SET);
+}
+
+void* FileDescriptor::Map(void* address,
+                          size_t length,
+                          int prot,
+                          int flags,
+                          off_t offset) {
+  return ::mmap(address, length, prot, flags, fd_, offset);
+}
+
+void FileDescriptor::Close() {
+  if (fd_ != -1) {
+    int old_errno = errno;
+    TEMP_FAILURE_RETRY(close(fd_));
+    errno = old_errno;
+    fd_ = -1;
+  }
+}
+
+const char* GetEnv(const char* var_name) { return ::getenv(var_name); }
+
+String GetCurrentDirectory() {
+  String result;
+  size_t capacity = 128;
+  for (;;) {
+    result.Resize(capacity);
+    if (getcwd(&result[0], capacity))
+      break;
+    capacity *= 2;
+  }
+  return result;
+}
+
+bool PathExists(const char* path) {
+  struct stat st;
+  if (TEMP_FAILURE_RETRY(stat(path, &st)) < 0)
+    return false;
+
+  return S_ISREG(st.st_mode) || S_ISDIR(st.st_mode);
+}
+
+bool PathIsFile(const char* path) {
+  struct stat st;
+  if (TEMP_FAILURE_RETRY(stat(path, &st)) < 0)
+    return false;
+
+  return S_ISREG(st.st_mode);
+}
+
+#endif  // !UNIT_TESTS
+
+}  // namespace crazy