Android: Add chrome-specific dynamic linker.

third_party/crazy_linker/crazy_linker/src/crazy_linker_ashmem.cpp

+// Copyright (c) 2013 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_ashmem.h"
+
+#include <fcntl.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <linux/ashmem.h>
+
+#include "crazy_linker_system.h"
+
+namespace crazy {
+
+bool AshmemRegion::Allocate(size_t region_size, const char* region_name) {
+  int fd = TEMP_FAILURE_RETRY(open("/dev/ashmem", O_RDWR));
+  if (fd < 0)
+    return false;
+
+  if (ioctl(fd, ASHMEM_SET_SIZE, region_size) < 0)
+    goto ERROR;
+
+  if (region_name) {
+    char buf[256];
+    strlcpy(buf, region_name, sizeof(buf));
+    if (ioctl(fd, ASHMEM_SET_NAME, buf) < 0)
+      goto ERROR;
+  }
+
+  Reset(fd);
+  return true;
+
+ERROR:
+  ::close(fd);
+  return false;
+}
+
+bool AshmemRegion::SetProtectionFlags(int prot) {
+  return ioctl(fd_, ASHMEM_SET_PROT_MASK, prot) == 0;
+}
+}  // namespace crazy