Add a recipe for fetching pdfium.

recipes/pdfium.py

Index: recipes/pdfium.py
===================================================================
--- recipes/pdfium.py	(revision 0)
+++ recipes/pdfium.py	(working copy)
@@ -0,0 +1,40 @@
+# 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))