Add Pdfium to list of can-be-patched projects in chromium checkout.

recipe_modules/gclient/config.py

 # 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.
 
 import types
 
 from recipe_engine.config import config_item_context, ConfigGroup, BadConf
 from recipe_engine.config import ConfigList, Dict, Single, Static, Set, List
 
 from . import api as gclient_api
@@ skipping 148 matching lines @@
   p['parent_got_angle_revision'] = 'angle_revision'
   p['parent_got_nacl_revision'] = 'nacl_revision'
   p['parent_got_swarming_client_revision'] = 'swarming_revision'
   p['parent_got_v8_revision'] = 'v8_revision'
   p['parent_got_webrtc_revision'] = 'webrtc_revision'
 
   p = c.patch_projects
   p['v8'] = ('src/v8', 'HEAD')
   p['angle/angle'] = ('src/third_party/angle', None)
   p['blink'] = ('src/third_party/WebKit', None)
+  p['pdfium'] = ('src/third_party/pdfium', 'HEAD')
 
 @config_ctx(includes=['chromium_bare'])
 def chromium_empty(c):
   c.solutions[0].deps_file = ''  # pragma: no cover
 
 @config_ctx(includes=['chromium_bare'])
 def chromium(c):
   s = c.solutions[0]
   s.custom_deps = mirror_only(c, {})
 
@@ skipping 478 matching lines @@
   soln = c.solutions.add()
   soln.name = 'gerrit-test-cq-normal'
   soln.url = 'https://chromium.googlesource.com/playground/gerrit-cq/normal.git'
 
 # TODO(phajdan.jr): Move to proper repo and add coverage.
 @config_ctx()
 def valgrind(c):  # pragma: no cover
   """Add Valgrind binaries to the gclient solution."""
   c.solutions[0].custom_deps['src/third_party/valgrind'] = \
     ChromiumGitURL(c, 'chromium', 'deps', 'valgrind', 'binaries')