Add a simple check for V4 cross reference table

DEPS

 use_relative_paths = True
 
 vars = {
   'chromium_git': 'https://chromium.googlesource.com',
   'pdfium_git': 'https://pdfium.googlesource.com',
 
   'build_revision': '2f91397926336dd46ea49ffef702197b9cc2215a',
   'buildtools_revision': '5378d73123b64907773cc5c1bb027b2f765ff00a',
   'clang_revision': '2956eca572ff0e1b181df65f71a045f061a2eb34',
   'cygwin_revision': 'c89e446b273697fadf3a10ff1007a97c0b7de6df',
@@ skipping 49 matching lines @@
   },
 }
 
 include_rules = [
   # Basic stuff that everyone can use.
   # Note: public is not here because core cannot depend on public.
   '+testing',
   '+third_party/base',
 ]
 
+specific_include_rules = {
+  # Allow embedder tests to use public APIs.
+  "(.*embeddertest\.cpp)": [
+      "+public",
+  ]
+}
+
 hooks = [
   # Pull GN binaries. This needs to be before running GYP below.
   {
     'name': 'gn_win',
     'action': [ 'download_from_google_storage',
                 '--no_resume',
                 '--platform=win32',
                 '--no_auth',
                 '--bucket', 'chromium-gn',
                 '-s', 'pdfium/buildtools/win/gn.exe.sha1',
@@ skipping 76 matching lines @@
   {
     # Pull clang if needed or requested via GYP_DEFINES.
     'name': 'clang',
     'pattern': '.',
     'action': ['python',
                'pdfium/tools/clang/scripts/update.py',
                '--if-needed'
     ],
   },
 ]