Add a recipe for fetching pdfium.

With this, `fetch pdfium` is all that's needed to get a pdfium checkout.

Review URL: https://codereview.chromium.org/1415243002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@297340 0039d316-1c4b-4281-b951-d872f2087c98

recipes/pdfium.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.
+
+import sys
+
+import recipe_util  # pylint: disable=F0401
+
+
+# This class doesn't need an __init__ method, so we disable the warning
+# pylint: disable=W0232
+class PdfiumRecipe(recipe_util.Recipe):
+  """Basic Recipe class for pdfium."""
+
+  @staticmethod
+  def fetch_spec(props):
+    return {
+      'type': 'gclient_git',
+      'gclient_git_spec': {
+        'solutions': [
+          {
+            'name': 'pdfium',
+            'url': 'https://pdfium.googlesource.com/pdfium.git',
+            'managed': False,
+          },
+        ],
+      },
+    }
+
+  @staticmethod
+  def expected_root(_props):
+    return 'pdfium'
+
+
+def main(argv=None):
+  return PdfiumRecipe().handle_args(argv)
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))