Add a .gypi to insulate Chrome from refactorings in src/record.

gyp/record.gyp

 # An experimental library for faster recording of SkCanvas commands.
 {
     'targets': [{
         'target_name': 'record',
         'type': 'static_library',
+        'includes': [ 'record.gypi' ],
         'include_dirs': [
             '../include/config',
             '../include/core',
             '../include/record',
         ],
         'direct_dependent_settings': {
             'include_dirs': [
                 '../include/record',  # Public headers.
             ],
         },
-        'sources': [
-            '../src/record/SkRecordOpts.cpp',
-            '../src/record/SkRecordDraw.cpp',
-            '../src/record/SkRecorder.cpp',
-            '../src/record/SkRecording.cpp',
-        ],
     }]
 }