Add initial Document::getAnnot support

pdfium.gyp

 # Copyright 2015 PDFium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'chromium_code': 1,
     'pdf_use_skia%': 0,
     'pdf_enable_v8%': 1,
     'pdf_enable_xfa%': 0, # Set to 1 by standalone.gypi in a standalone build.
@@ skipping 848 matching lines @@
       ],
       'conditions': [
         ['pdf_enable_v8==1', {
           'dependencies': [
             ':fxjs'
           ],
           'sources!': [
             'fpdfsdk/javascript/JS_Runtime_Stub.cpp',
           ],
           'sources': [
+            'fpdfsdk/javascript/Annot.cpp',
+            'fpdfsdk/javascript/Annot.h',
             'fpdfsdk/javascript/Consts.cpp',
             'fpdfsdk/javascript/Consts.h',
             'fpdfsdk/javascript/Document.cpp',
             'fpdfsdk/javascript/Document.h',
             'fpdfsdk/javascript/Field.cpp',
             'fpdfsdk/javascript/Field.h',
             'fpdfsdk/javascript/Icon.cpp',
             'fpdfsdk/javascript/Icon.h',
             'fpdfsdk/javascript/JS_Define.h',
             'fpdfsdk/javascript/JS_EventHandler.cpp',
@@ skipping 273 matching lines @@
             'fpdfsdk/fpdfxfa/include/fpdfxfa_app.h',
             'fpdfsdk/fpdfxfa/include/fpdfxfa_doc.h',
             'fpdfsdk/fpdfxfa/include/fpdfxfa_page.h',
             'fpdfsdk/fpdfxfa/include/fpdfxfa_util.h',
           ],
         },
       ]
     }],
   ]
 }