Update from https://crrev.com/303153

base/android/library_loader/library_load_from_apk_status_codes.h

 // 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.
 
 #ifndef BASE_ANDROID_LIBRARY_LOAD_FROM_APK_STATUS_CODES_H_
 #define BASE_ANDROID_LIBRARY_LOAD_FROM_APK_STATUS_CODES_H_
 
 namespace base {
 namespace android {
 
 namespace {
 
+// This enum must be kept in sync with the LibraryLoadFromApkStatus enum in
+// tools/metrics/histograms/histograms.xml.
 // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.base.library_loader
 enum LibraryLoadFromApkStatusCodes {
   // The loader was unable to determine whether the functionality is supported.
   LIBRARY_LOAD_FROM_APK_STATUS_CODES_UNKNOWN = 0,
 
   // The device does not support loading a library directly from the APK file.
   LIBRARY_LOAD_FROM_APK_STATUS_CODES_NOT_SUPPORTED = 1,
 
   // The device supports loading a library directly from the APK file.
   LIBRARY_LOAD_FROM_APK_STATUS_CODES_SUPPORTED = 2,
 
   // The Chromium library was successfully loaded directly from the APK file.
   LIBRARY_LOAD_FROM_APK_STATUS_CODES_SUCCESSFUL = 3,
 
-  // The Chromium library was not page aligned in the APK file.
-  LIBRARY_LOAD_FROM_APK_STATUS_CODES_NOT_ALIGNED = 4,
+  // The Chromium library was successfully loaded using the unpack library
+  // fallback because it was compressed or not page aligned in the APK file.
+  LIBRARY_LOAD_FROM_APK_STATUS_CODES_USED_UNPACK_LIBRARY_FALLBACK = 4,
+
+  // The Chromium library was successfully loaded using the no map executable
+  // support fallback.
+  LIBRARY_LOAD_FROM_APK_STATUS_CODES_USED_NO_MAP_EXEC_SUPPORT_FALLBACK = 5,
 
   // End sentinel.
-  LIBRARY_LOAD_FROM_APK_STATUS_CODES_MAX = 5,
+  LIBRARY_LOAD_FROM_APK_STATUS_CODES_MAX = 6,
 };
 
 }  // namespace
 
 }  // namespace android
 }  // namespace base
 
 #endif  // BASE_ANDROID_LIBRARY_LOAD_FROM_APK_STATUS_CODES_H_