[Android] Make dex exclude paths relative to output dir.

build/config/android/internal_rules.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.
 
 import("//build/config/android/config.gni")
 
 assert(is_android)
 
 rebased_android_sdk = rebase_path(android_sdk, root_build_dir)
 rebased_android_sdk_root = rebase_path(android_sdk_root, root_build_dir)
@@ skipping 133 matching lines @@
       deps = invoker.deps
     }
 
     rebased_output = rebase_path(invoker.output, root_build_dir)
 
     args = [
       "--depfile",
       rebase_path(depfile, root_build_dir),
       "--android-sdk-tools",
       rebased_android_sdk_build_tools,
+      "--output-directory",
+      rebase_path(root_build_dir, root_build_dir),
       "--dex-path",
       rebased_output,
     ]
 
     if (defined(invoker.no_locals) && invoker.no_locals) {
       args += [ "--no-locals=1" ]
     }
 
     if (defined(invoker.args)) {
       args += invoker.args
@@ skipping 1400 matching lines @@
     ]
     args = [
       "--depfile",
       rebase_path(depfile, root_build_dir),
       "--script-output-path",
       rebase_path(generated_script, root_build_dir),
     ]
     args += test_runner_args
   }
 }