Fix resource_sizes.py breaking if CWD!=src

build/android/BUILD.gn

 # 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")
 import("//build/config/android/rules.gni")
 
 if (enable_java_templates) {
   import("//third_party/ijar/ijar.gni")
 
@@ skipping 34 matching lines @@
   # Write to a file some GN vars that are useful to scripts that use the output
   # directory. Format is chosen as easliy importable by both python and bash.
   CR = "$0x0A"
   _data = ""
   _data += "android_sdk_build_tools=" +
            rebase_path(android_sdk_build_tools, root_build_dir) + CR
   _data += "android_sdk_build_tools_version=$android_sdk_build_tools_version$CR"
   _data +=
       "android_sdk_root=" + rebase_path(android_sdk_root, root_build_dir) + CR
   _data += "android_sdk_version=$android_sdk_version$CR"
-  _data += "android_tool_prefix=$android_tool_prefix"
+  _data += "android_tool_prefix=" +
+           rebase_path(android_tool_prefix, root_build_dir) + CR
   write_file("$root_build_dir/build_vars.txt", _data)
 }
 
 # Copy to the lib.unstripped directory so that gdb can easily find it.
 copy("cpplib_unstripped") {
   _soname = "libc++_shared.so"
   sources = [
     "${android_libcpp_lib_dir}/${_soname}",
   ]
   outputs = [
@@ skipping 78 matching lines @@
   _target_name = get_path_info(script, "name") + "_wrapper"
   _wrapper_targets += [ ":$_target_name" ]
   wrapper_script(_target_name) {
     target = script
   }
 }
 
 group("wrapper_scripts") {
   deps = _wrapper_targets
 }