Split off CPDF_Document into its own .cpp/.h files.

BUILD.gn

 # Copyright 2016 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("//build_overrides/v8.gni")
 import("//testing/test.gni")
 import("pdfium.gni")
 
 config("pdfium_config") {
   cflags = []
@@ skipping 219 matching lines @@
     "core/src/fpdfdoc/doc_vt.cpp",
     "core/src/fpdfdoc/doc_vtmodule.cpp",
     "core/src/fpdfdoc/pdf_vt.h",
     "core/src/fpdfdoc/tagged_int.h",
   ]
   configs += [ ":pdfium_config" ]
 }
 
 static_library("fpdfapi") {
   sources = [
+    "core/include/fpdfapi/cpdf_document.h",
     "core/include/fpdfapi/fpdf_module.h",
     "core/include/fpdfapi/fpdf_objects.h",
     "core/include/fpdfapi/fpdf_page.h",
     "core/include/fpdfapi/fpdf_pageobj.h",
     "core/include/fpdfapi/fpdf_parser.h",
     "core/include/fpdfapi/fpdf_render.h",
     "core/include/fpdfapi/fpdf_resource.h",
     "core/include/fpdfapi/fpdf_serial.h",
     "core/src/fpdfapi/fpdf_basic_module.cpp",
     "core/src/fpdfapi/fpdf_cmaps/CNS1/Adobe-CNS1-UCS2_5.cpp",
@@ skipping 74 matching lines @@
     "core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp",
     "core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp",
     "core/src/fpdfapi/fpdf_page/fpdf_page_func.cpp",
     "core/src/fpdfapi/fpdf_page/fpdf_page_graph_state.cpp",
     "core/src/fpdfapi/fpdf_page/fpdf_page_image.cpp",
     "core/src/fpdfapi/fpdf_page/fpdf_page_parser.cpp",
     "core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp",
     "core/src/fpdfapi/fpdf_page/fpdf_page_path.cpp",
     "core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp",
     "core/src/fpdfapi/fpdf_page/pageint.h",
+    "core/src/fpdfapi/fpdf_parser/cpdf_document.cpp",
     "core/src/fpdfapi/fpdf_parser/cpdf_syntax_parser.cpp",
     "core/src/fpdfapi/fpdf_parser/cpdf_syntax_parser.h",
     "core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp",
-    "core/src/fpdfapi/fpdf_parser/fpdf_parser_document.cpp",
     "core/src/fpdfapi/fpdf_parser/fpdf_parser_encrypt.cpp",
     "core/src/fpdfapi/fpdf_parser/fpdf_parser_fdf.cpp",
     "core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp",
     "core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp",
     "core/src/fpdfapi/fpdf_parser/fpdf_parser_utility.cpp",
     "core/src/fpdfapi/fpdf_parser/parser_int.h",
     "core/src/fpdfapi/fpdf_render/fpdf_render.cpp",
     "core/src/fpdfapi/fpdf_render/fpdf_render_cache.cpp",
     "core/src/fpdfapi/fpdf_render/fpdf_render_image.cpp",
     "core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp",
@@ skipping 1148 matching lines @@
       "//v8:v8_libplatform",
     ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
     configs += [ "//v8:external_startup_data" ]
   }
   configs += [ ":pdfium_config" ]
 }