Add a snapshot of flutter/engine/src/build to our sdk

build/android/gyp/write_ordered_libraries.py

Index: build/android/gyp/write_ordered_libraries.py
diff --git a/build/android/gyp/write_ordered_libraries.py b/build/android/gyp/write_ordered_libraries.py
new file mode 100755
index 0000000000000000000000000000000000000000..0fc9a8ca3ef2de04b7283362603ed4556d94c354
--- /dev/null
+++ b/build/android/gyp/write_ordered_libraries.py
@@ -0,0 +1,144 @@
+#!/usr/bin/env python
+#
+# Copyright 2013 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.
+
+"""Writes dependency ordered list of native libraries.
+
+The list excludes any Android system libraries, as those are not bundled with
+the APK.
+
+This list of libraries is used for several steps of building an APK.
+In the component build, the --input-libraries only needs to be the top-level
+library (i.e. libcontent_shell_content_view). This will then use readelf to
+inspect the shared libraries and determine the full list of (non-system)
+libraries that should be included in the APK.
+"""
+
+# TODO(cjhopman): See if we can expose the list of library dependencies from
+# gyp, rather than calculating it ourselves.
+# http://crbug.com/225558
+
+import optparse
+import os
+import re
+import sys
+
+from util import build_utils
+
+_readelf = None
+_library_dirs = None
+
+_library_re = re.compile(
+    '.*NEEDED.*Shared library: \[(?P<library_name>.+)\]')
+
+
+def SetReadelfPath(path):
+  global _readelf
+  _readelf = path
+
+
+def SetLibraryDirs(dirs):
+  global _library_dirs
+  _library_dirs = dirs
+
+
+def FullLibraryPath(library_name):
+  assert _library_dirs is not None
+  for directory in _library_dirs:
+    path = '%s/%s' % (directory, library_name)
+    if os.path.exists(path):
+      return path
+  return library_name
+
+
+def IsSystemLibrary(library_name):
+  # If the library doesn't exist in the libraries directory, assume that it is
+  # an Android system library.
+  return not os.path.exists(FullLibraryPath(library_name))
+
+
+def CallReadElf(library_or_executable):
+  assert _readelf is not None
+  readelf_cmd = [_readelf,
+                 '-d',
+                 FullLibraryPath(library_or_executable)]
+  return build_utils.CheckOutput(readelf_cmd)
+
+
+def GetDependencies(library_or_executable):
+  elf = CallReadElf(library_or_executable)
+  return set(_library_re.findall(elf))
+
+
+def GetNonSystemDependencies(library_name):
+  all_deps = GetDependencies(library_name)
+  return set((lib for lib in all_deps if not IsSystemLibrary(lib)))
+
+
+def GetSortedTransitiveDependencies(libraries):
+  """Returns all transitive library dependencies in dependency order."""
+  return build_utils.GetSortedTransitiveDependencies(
+      libraries, GetNonSystemDependencies)
+
+
+def GetSortedTransitiveDependenciesForBinaries(binaries):
+  if binaries[0].endswith('.so'):
+    libraries = [os.path.basename(lib) for lib in binaries]
+  else:
+    assert len(binaries) == 1
+    all_deps = GetDependencies(binaries[0])
+    libraries = [lib for lib in all_deps if not IsSystemLibrary(lib)]
+
+  return GetSortedTransitiveDependencies(libraries)
+
+
+def main():
+  parser = optparse.OptionParser()
+  build_utils.AddDepfileOption(parser)
+
+  parser.add_option('--input-libraries',
+      help='A list of top-level input libraries.')
+  parser.add_option('--libraries-dir',
+      help='The directory which contains shared libraries.')
+  parser.add_option('--readelf', help='Path to the readelf binary.')
+  parser.add_option('--output', help='Path to the generated .json file.')
+  parser.add_option('--stamp', help='Path to touch on success.')
+
+  options, _ = parser.parse_args()
+
+  SetReadelfPath(options.readelf)
+  SetLibraryDirs(options.libraries_dir.split(','))
+
+  libraries = build_utils.ParseGypList(options.input_libraries)
+  if len(libraries):
+    libraries = GetSortedTransitiveDependenciesForBinaries(libraries)
+
+  # Convert to "base" library names: e.g. libfoo.so -> foo
+  java_libraries_list = (
+      '{%s}' % ','.join(['"%s"' % s[3:-3] for s in libraries]))
+
+  out_json = {
+      'libraries': libraries,
+      'lib_paths': [FullLibraryPath(l) for l in libraries],
+      'java_libraries_list': java_libraries_list
+      }
+  build_utils.WriteJson(
+      out_json,
+      options.output,
+      only_if_changed=True)
+
+  if options.stamp:
+    build_utils.Touch(options.stamp)
+
+  if options.depfile:
+    build_utils.WriteDepfile(
+        options.depfile,
+        libraries + build_utils.GetPythonDependencies())
+
+
+if __name__ == '__main__':
+  sys.exit(main())
+
+