android: dcheck_always_on sets BuildConfig.IS_DCHECK

build/config/android/config.gni

 # 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.
 
 # This file contains common system config stuff for the Android build.
 
 if (is_android) {
   assert(rebase_path("//", root_build_dir) == "../../",
          "Android output directory must be nested 2 levels within src/ (" +
              "e.g.: out-gn/Debug). http://crbug.com/412935")
@@ skipping 81 matching lines @@
     run_findbugs = false
 
     # Set to true to enable verbose findbugs logging. This does nothing if
     # run_findbugs is false.
     findbugs_verbose = false
 
     # Enables verbose proguard output (summaries and unfiltered output).
     proguard_verbose = false
 
     # Java debug on Android. Having this on enables multidexing, and turning it
-    # off will enable proguard. To access this flag from within Java code, look
-    # at BuildConfig.IS_DEBUG, which is wired to this arg.
+    # off will enable proguard.
     is_java_debug = is_debug
 
     # Set to true to enable the Errorprone compiler
     use_errorprone_java_compiler = false
 
     # Enables EMMA Java code coverage. Instruments classes during build to
     # produce .ec files during runtime
     emma_coverage = false
 
     # EMMA filter string consisting of a list of inclusion/exclusion patterns
@@ skipping 203 matching lines @@
   if (defined(android_secondary_abi_cpu)) {
     if (is_clang) {
       android_secondary_abi_toolchain =
           "//build/toolchain/android:clang_${android_secondary_abi_cpu}"
     } else {
       android_secondary_abi_toolchain =
           "//build/toolchain/android:${android_secondary_abi_cpu}"
     }
   }
 }