isolate podofo to prepare for native parser, autogenerate PDF API during build

gyp/pdfviewer.gyp

 # GYP file to build pdfviewer.
 #
 # To build on Linux:
 #  ./gyp_skia pdfviewer.gyp && make pdfviewer
 #
 {
   'variables': {
     'skia_warnings_as_errors': 0,
   },
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
     {
       'target_name': 'libpdfviewer',
       'type': 'static_library',
       'cflags': ['-fexceptions'],
       'cflags_cc': ['-fexceptions'],
       'cflags!': [ '-fno-exceptions' ],
       'cflags_cc!': [ '-fno-exceptions' ],
       'sources': [
         '../experimental/PdfViewer/SkPdfBasics.cpp',
         '../experimental/PdfViewer/SkPdfFont.cpp',
         '../experimental/PdfViewer/SkPdfParser.cpp',
         '../experimental/PdfViewer/SkPdfUtils.cpp',
-        '../experimental/PdfViewer/pdfparser/podofo/autogen/SkPdfPodofoMapper_autogen.cpp',
+        #'../experimental/PdfViewer/SkPdfNYI.cpp',
+        #podofo
+        '../experimental/PdfViewer/pdfparser/podofo/SkPdfPodofoTokenizer.cpp',
+        '../experimental/PdfViewer/pdfparser/podofo/SkPodofoParsedPDF.cpp',
+        '../experimental/PdfViewer/pdfparser/podofo/SkPodofoUtils.cpp',
+        '../experimental/PdfViewer/pdfparser/podofo/autogen/SkPdfMapper_autogen.cpp',
         '../experimental/PdfViewer/pdfparser/podofo/autogen/SkPdfHeaders_autogen.cpp',
+        #native TODO
+
+        # libraries.cc is generated by the js2c action below.
+        #'<(INTERMEDIATE_DIR)/libraries.cc',
+      ],
+      'actions': [
+        {
+          'action_name': 'spec2def',
+          'inputs': [
+            '../experimental/PdfViewer/spec2def.py',
+            '../experimental/PdfViewer/PdfReference-okular-1.txt',
+          ],
+          'outputs': [
+            '../experimental/PdfViewer/autogen/pdfspec_autogen.py',
+          ],
+          'action': ['python', '../experimental/PdfViewer/spec2def.py', '../experimental/PdfViewer/PdfReference-okular-1.txt', '../experimental/PdfViewer/autogen/pdfspec_autogen.py'],
+        },
+        {
+          'action_name': 'generate_code',
+          'inputs': [
+            '../experimental/PdfViewer/generate_code.py',
+            '../experimental/PdfViewer/autogen/pdfspec_autogen.py',
+          ],
+          'outputs': [
+            '../experimental/PdfViewer/pdfparser/autogen/SkPdfEnums_autogen.h',
+            '../experimental/PdfViewer/pdfparser/podofo/autogen/SkPdfMapper_autogen.cpp',
+            '../experimental/PdfViewer/pdfparser/podofo/autogen/SkPdfHeaders_autogen.cpp',
+            # TODO(edisonn): ok, there are many more files here, which we should list but since
+            # any change in the above should trigger a change here, we should be fine normally
+          ],
+          'action': ['python', '../experimental/PdfViewer/generate_code.py', '../experimental/PdfViewer/pdfparser/'],
+        },
       ],
       'include_dirs': [
         '../third_party/externals/podofo/src/base',
         '../third_party/externals/podofo/src',
         '../third_party/externals/podofo',
         '../tools',
         '../experimental/PdfViewer',
         '../experimental/PdfViewer/pdfparser',
+        '../experimental/PdfViewer/pdfparser/autogen',
         '../experimental/PdfViewer/pdfparser/podofo',
         '../experimental/PdfViewer/pdfparser/podofo/autogen',
-        #'../experimental/PdfViewer/pdfparser/native',
-        #'../experimental/PdfViewer/pdfparser/native/autogen',
       ],
       'dependencies': [
         'core.gyp:core',
         'effects.gyp:effects',
         'images.gyp:images',
         'pdf.gyp:pdf',
         'ports.gyp:ports',
         'tools.gyp:picture_utils',
         '../third_party/externals/podofo/podofo.gyp:podofo',
       ],
       'link_settings': {
         'libraries': [
         ],
       },
       'defines': [
         'BUILDING_PODOFO',
       ],
     },
     {
       'target_name': 'pdfviewer',
       'type': 'executable',
       'cflags': ['-fexceptions'],
       'cflags_cc': ['-fexceptions'],
       'cflags!': [ '-fno-exceptions' ],
       'cflags_cc!': [ '-fno-exceptions' ],
       'sources': [
         '../experimental/PdfViewer/pdf_viewer_main.cpp',
       ],
       'include_dirs': [
-        '../third_party/externals/podofo/src/base',
-        '../third_party/externals/podofo/src',
-        '../third_party/externals/podofo',
         '../tools',
         '../experimental/PdfViewer',
-        '../experimental/PdfViewer/autogen',
+        '../experimental/PdfViewer/pdfparser',
+        '../experimental/PdfViewer/pdfparser/autogen',
+        '../experimental/PdfViewer/pdfparser/podofo',
+        '../experimental/PdfViewer/pdfparser/podofo/autogen',
       ],
       'dependencies': [
         'core.gyp:core',
         'images.gyp:images',
         'libpdfviewer',
       ],
     },
   ],
 }
 
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