Update bower.json for Polymer elements and add PRESUBMIT.py

third_party/polymer/v1_0/PRESUBMIT.py

+# Copyright 2015 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.
+
+"""Chromium presubmit script for third_party/polymer/v1_0.
+
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
+for more details on the presubmit API built into depot_tools.
+"""
+
+import os
+import json
+
+def _CheckBowerDependencies(input_api, output_api):
+  os_path = input_api.os_path
+  cwd = input_api.PresubmitLocalPath()
+  components_dir = os_path.join(cwd, 'components')
+  bower_json_path = os_path.join(cwd, 'bower.json')
+
+  for f in input_api.AffectedFiles(include_dirs=True):
+    p = f.AbsoluteLocalPath()
+    if p == bower_json_path or p.startswith(components_dir):
+      break
+  else:

[Jeremy Klein, 2015/07/07 17:05:49]

I'd never seen this for .. else pattern before. Interesting.

[michaelpg, 2015/07/07 17:37:50]

I thought it was neat. This was all written by dzhioev@ for the original
third_party/polymer/PRESUBMIT.py.

+      return []
+
+  bower_dependencies = \
+      set(json.load(open(bower_json_path))['dependencies'].keys())
+  installed_components = set(p for p in os.listdir(components_dir))
+  # Add web-animations-js because we keep it in a separate directory
+  # '../third_party/web-animations-js'.
+  installed_components.add('web-animations-js')
+
+  if bower_dependencies == installed_components:
+    return []
+
+  problems = []
+
+  if installed_components - bower_dependencies:
+    problems.append(output_api.PresubmitError(
+        'Found components that are not listed in bower.json.',
+        items = list(installed_components - bower_dependencies)))
+
+  if bower_dependencies - installed_components:
+    problems.append(output_api.PresubmitError(
+        'Some of the Bower dependencies are not installed.',
+        items = list(bower_dependencies - installed_components)))
+
+  return problems
+
+
+def CheckChangeOnUpload(input_api, output_api):
+  return _CheckBowerDependencies(input_api, output_api)
+
+
+def CheckChangeOnCommit(input_api, output_api):
+  return _CheckBowerDependencies(input_api, output_api)