[android] Stop using isolate.py for data dependency management.

build/android/pylib/utils/device_dependencies.py

+# Copyright 2016 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 ast
+import os
+
+from pylib import constants
+
+
+def DevicePathComponentsFor(host_path, output_directory):
+  """Returns the device path components for a given host path.
+
+  This returns the device path as a list of joinable path compoents,

[agrieve, 2016/11/15 15:51:01]

compoents

[jbudorick, 2016/11/15 19:33:15]

Doe

+  with None as the first element to indicate that the path should be
+  rooted at $EXTERNAL_STORAGE.
+
+  e.g., given
+
+    '$CHROMIUM_SRC/foo/bar/baz.txt'
+
+  this would return
+
+    [None, 'foo', 'bar', 'baz.txt']
+
+  This handles a couple classes of paths differently than it otherwise would:
+    - All .pak files get mapped to top-level paks/
+    - Anything in the output directory gets mapped relative to the output
+      directory rather than the source directory.
+
+  e.g. given
+
+    '$CHROMIUM_SRC/out/Release/icu_fake_dir/icudtl.dat'
+
+  this would return
+
+    [None, 'icu_fake_dir', 'icudtl.dat']
+
+  Args:
+    host_path: The absolute path to the host file.
+  Returns:
+    A list of device path components.
+  """
+  if os.path.commonprefix([output_directory, host_path]) == output_directory:

[agrieve, 2016/11/15 15:51:01]

commonprefix just does string comparison. So.. I think would be simpler as:
  host_path.startswith(output_directory)

[jbudorick, 2016/11/15 19:33:15]

Done.

+    if os.path.splitext(host_path)[1] == '.pak':
+      return [None, 'paks', os.path.basename(host_path)]
+    rel_host_path = os.path.relpath(host_path, output_directory)
+  else:
+    rel_host_path = os.path.relpath(host_path, constants.DIR_SOURCE_ROOT)
+
+  device_path_components = [None]
+  p = rel_host_path
+  while p:
+    p, d = os.path.split(p)
+    if d:
+      device_path_components.insert(1, d)
+  return device_path_components
+
+
+def GetDataDependencies(isolate_file_path):
+  """Returns a list of device data dependencies.
+
+  Args:
+    isolate_file_path: A str path to the isolate file.
+  Returns:
+    A list of (host_path, device_path) tuples.
+  """
+  if not isolate_file_path:
+    return []
+
+  with open(isolate_file_path, 'r') as isolate_file:
+    isolate_contents = ast.literal_eval(isolate_file.read())
+
+  isolate_file_dir = os.path.dirname(isolate_file_path)
+  rel_host_files = isolate_contents.get('variables', {}).get('files', [])
+  abs_host_files = [
+      os.path.abspath(os.path.join(isolate_file_dir, r))
+      for r in rel_host_files]
+
+  return [(a, DevicePathComponentsFor(a, constants.GetOutDirectory()))
+          for a in abs_host_files]
+