Update to Chromium //base at Chromium commit 01cb97b2e09618bbc3a60c7348f0a844eea20547.

android/linker/android_dlext.h

+// 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.
+
+// Definitions for android_dlopen_ext().
+//
+// This function was added for Android L-MR1 and made available in android-21
+// but we currently build Chromium with android-16. Placing the declarations
+// we need here allows code that uses android_dlopen_ext() to build with
+// android-16. At runtime we check the target's SDK_INT to ensure that we
+// are on a system new enough to offer this function, and also only access
+// it with dlsym so that the runtime linker on pre-Android L-MR1 targets will
+// not complain about a missing symbol when loading our library.
+//
+// Details below taken from:
+//   third_party/android_tools/ndk/platforms/android-21
+//       /arch-arm/usr/include/android/dlext.h
+//
+// Although taken specifically from arch-arm, there are no architecture-
+// specific elements in dlext.h. All android-21/arch-* directories contain
+// identical copies of dlext.h.
+
+#ifndef BASE_ANDROID_LINKER_ANDROID_DLEXT_H_
+#define BASE_ANDROID_LINKER_ANDROID_DLEXT_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+/* bitfield definitions for android_dlextinfo.flags */
+enum {
+  /* When set, the reserved_addr and reserved_size fields must point to an
+   * already-reserved region of address space which will be used to load the
+   * library if it fits. If the reserved region is not large enough, the load
+   * will fail.
+   */
+  ANDROID_DLEXT_RESERVED_ADDRESS = 0x1,
+
+  /* As DLEXT_RESERVED_ADDRESS, but if the reserved region is not large enough,
+   * the linker will choose an available address instead.
+   */
+  ANDROID_DLEXT_RESERVED_ADDRESS_HINT = 0x2,
+
+  /* When set, write the GNU RELRO section of the mapped library to relro_fd
+   * after relocation has been performed, to allow it to be reused by another
+   * process loading the same library at the same address. This implies
+   * ANDROID_DLEXT_USE_RELRO.
+   */
+  ANDROID_DLEXT_WRITE_RELRO = 0x4,
+
+  /* When set, compare the GNU RELRO section of the mapped library to relro_fd
+   * after relocation has been performed, and replace any relocated pages that
+   * are identical with a version mapped from the file.
+   */
+  ANDROID_DLEXT_USE_RELRO = 0x8,
+
+  /* Instruct dlopen to use library_fd instead of opening file by name.
+   * The filename parameter is still used to identify the library.
+   */
+  ANDROID_DLEXT_USE_LIBRARY_FD = 0x10,
+
+  /* Mask of valid bits */
+  ANDROID_DLEXT_VALID_FLAG_BITS = ANDROID_DLEXT_RESERVED_ADDRESS |
+                                  ANDROID_DLEXT_RESERVED_ADDRESS_HINT |
+                                  ANDROID_DLEXT_WRITE_RELRO |
+                                  ANDROID_DLEXT_USE_RELRO |
+                                  ANDROID_DLEXT_USE_LIBRARY_FD,
+};
+
+typedef struct {
+  uint64_t flags;
+  void* reserved_addr;
+  size_t reserved_size;
+  int relro_fd;
+  int library_fd;
+} android_dlextinfo;
+
+#endif  // BASE_ANDROID_LINKER_ANDROID_DLEXT_H_