Continue splitting pageint.h into per-class 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_common_config") {
   cflags = []
@@ skipping 420 matching lines @@
     "core/fpdfapi/page/cpdf_color.h",
     "core/fpdfapi/page/cpdf_colorspace.cpp",
     "core/fpdfapi/page/cpdf_colorspace.h",
     "core/fpdfapi/page/cpdf_colorstate.cpp",
     "core/fpdfapi/page/cpdf_colorstate.h",
     "core/fpdfapi/page/cpdf_contentmark.cpp",
     "core/fpdfapi/page/cpdf_contentmark.h",
     "core/fpdfapi/page/cpdf_contentmarkitem.cpp",
     "core/fpdfapi/page/cpdf_contentmarkitem.h",
     "core/fpdfapi/page/cpdf_contentparser.cpp",
+    "core/fpdfapi/page/cpdf_contentparser.h",
     "core/fpdfapi/page/cpdf_countedobject.h",
     "core/fpdfapi/page/cpdf_docpagedata.cpp",
     "core/fpdfapi/page/cpdf_docpagedata.h",
     "core/fpdfapi/page/cpdf_form.cpp",
     "core/fpdfapi/page/cpdf_form.h",
     "core/fpdfapi/page/cpdf_formobject.cpp",
     "core/fpdfapi/page/cpdf_formobject.h",
     "core/fpdfapi/page/cpdf_generalstate.cpp",
     "core/fpdfapi/page/cpdf_generalstate.h",
     "core/fpdfapi/page/cpdf_graphicstates.cpp",
@@ skipping 20 matching lines @@
     "core/fpdfapi/page/cpdf_pathobject.h",
     "core/fpdfapi/page/cpdf_pattern.cpp",
     "core/fpdfapi/page/cpdf_pattern.h",
     "core/fpdfapi/page/cpdf_shadingobject.cpp",
     "core/fpdfapi/page/cpdf_shadingobject.h",
     "core/fpdfapi/page/cpdf_shadingpattern.cpp",
     "core/fpdfapi/page/cpdf_shadingpattern.h",
     "core/fpdfapi/page/cpdf_streamcontentparser.cpp",
     "core/fpdfapi/page/cpdf_streamcontentparser.h",
     "core/fpdfapi/page/cpdf_streamparser.cpp",
+    "core/fpdfapi/page/cpdf_streamparser.h",
     "core/fpdfapi/page/cpdf_textobject.cpp",
     "core/fpdfapi/page/cpdf_textobject.h",
     "core/fpdfapi/page/cpdf_textstate.cpp",
     "core/fpdfapi/page/cpdf_textstate.h",
     "core/fpdfapi/page/cpdf_tilingpattern.cpp",
     "core/fpdfapi/page/cpdf_tilingpattern.h",
     "core/fpdfapi/page/fpdf_page_colors.cpp",
     "core/fpdfapi/page/fpdf_page_func.cpp",
     "core/fpdfapi/page/pageint.h",
     "core/fpdfapi/parser/cfdf_document.cpp",
@@ skipping 1351 matching lines @@
       "//samples",
     ]
   }
   group("fuzzers") {
     testonly = true
     deps = [
       "//testing/libfuzzer",
     ]
   }
 }