Add libpoppler PDF rasterizer

gyp/gm.gyp

 # GYP file to build the "gm" (golden master) executable.
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
     {
       'target_name': 'gm_expectations',
       'type': 'static_library',
       'include_dirs' : [
@@ skipping 42 matching lines @@
         '../src/utils/debugger/SkObjectParser.cpp',
       ],
       'dependencies': [
         'skia_lib.gyp:skia_lib',
         'flags.gyp:flags',
         'gm.gyp:gm_expectations',
         'jsoncpp.gyp:jsoncpp',
         'pdf.gyp:pdf',
       ],
       'conditions': [
+        ['skia_os in ["linux", "mac", "win"]', {
+          'dependencies': [
+            'poppler.gyp:libpoppler-cpp-gpl',
+          ],
+          'sources': [
+            '../src/utils/SkPDFRasterizer.cpp',
+          ],
+          'defines': [
+            'SK_BUILD_POPPLER',
+          ],
+        }],
         ['skia_os == "mac"', {
           'sources!': [
             '../gm/system_preferences_default.cpp',
           ],
           'sources': [
             '../gm/system_preferences_mac.mm',
           ],
           'link_settings': {
             'libraries': [
               '$(SDKROOT)/System/Library/Frameworks/Cocoa.framework',
@@ skipping 14 matching lines @@
       ],
     },
   ],
 }
 
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