Move pdf files into pdf.gypi

gyp/pdf.gyp

 {
   'targets': [
     {
       'target_name': 'pdf',
       'product_name': 'skia_pdf',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [
         'skia_lib.gyp:skia_lib',
         'zlib.gyp:zlib',
       ],
+      'includes': [
+        'pdf.gypi',
+      ],
       'include_dirs': [
         '../include/pdf',
         '../src/core', # needed to get SkGlyphCache.h and SkTextFormatParams.h
         '../src/utils', # needed to get SkBitSet.h
       ],
       'sources': [
-        '../include/pdf/SkPDFDevice.h',
-        '../include/pdf/SkPDFDocument.h',
-
-        '../src/pdf/SkPDFCatalog.cpp',
-        '../src/pdf/SkPDFCatalog.h',
-        '../src/pdf/SkPDFDevice.cpp',
-        '../src/pdf/SkPDFDocument.cpp',
-        '../src/pdf/SkPDFFont.cpp',
-        '../src/pdf/SkPDFFont.h',
-        '../src/pdf/SkPDFFontImpl.h',
-        '../src/pdf/SkPDFFormXObject.cpp',
-        '../src/pdf/SkPDFFormXObject.h',
-        '../src/pdf/SkPDFGraphicState.cpp',
-        '../src/pdf/SkPDFGraphicState.h',
-        '../src/pdf/SkPDFImage.cpp',
-        '../src/pdf/SkPDFImage.h',
-        '../src/pdf/SkPDFImageStream.cpp',
-        '../src/pdf/SkPDFImageStream.h',
-        '../src/pdf/SkPDFPage.cpp',
-        '../src/pdf/SkPDFPage.h',
-        '../src/pdf/SkPDFResourceDict.cpp',
-        '../src/pdf/SkPDFResourceDict.h',
-        '../src/pdf/SkPDFShader.cpp',
-        '../src/pdf/SkPDFShader.h',
-        '../src/pdf/SkPDFStream.cpp',
-        '../src/pdf/SkPDFStream.h',
-        '../src/pdf/SkPDFTypes.cpp',
-        '../src/pdf/SkPDFTypes.h',
-        '../src/pdf/SkPDFUtils.cpp',
-        '../src/pdf/SkPDFUtils.h',
-        '../src/pdf/SkTSet.h',
-
-        '../src/doc/SkDocument_PDF.cpp',
+        'pdf.gypi', # Makes the gypi appear in IDEs (but does not modify the build).
       ],
       # This section makes all targets that depend on this target
       # #define SK_SUPPORT_PDF and have access to the pdf header files.
       'direct_dependent_settings': {
         'defines': [
           'SK_SUPPORT_PDF',
         ],
         'include_dirs': [
           '../include/pdf',
         ],
       },
     },
   ],
 }
 
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