take 2: create simple 'skpmaker' tool to generate SKP files for testing

gyp/tools.gyp

 # GYP file to build various tools.
 #
 # To build on Linux:
 #  ./gyp_skia tools.gyp && make tools
 #
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
     {
       # Build all executable targets defined below.
       'target_name': 'tools',
       'type': 'none',
       'dependencies': [
+        'bbh_shootout',
         'bench_pictures',
         'filter',
+        'lua_app',
         'lua_pictures',
-        'bbh_shootout',
-        'lua_app',
         'pinspect',
         'render_pdfs',
         'render_pictures',
         'skdiff',
+        'skhello',
         'skpdiff',
-        'skhello',
+        'skpmaker',
         'skimage',
         'test_image_decoder',
       ],
       'conditions': [
         ['skia_shared_lib',
           {
             'dependencies': [
               'sklua', # This can only be built if skia is built as a shared library
             ],
           },
@@ skipping 66 matching lines @@
             }],
           ],
         }, { # !skia_opencl
           'sources': [
             '../tools/skpdiff/SkDifferentPixelsMetric_cpu.cpp',
           ],
         }],
       ],
     },
     {
+      'target_name': 'skpmaker',
+      'type': 'executable',
+      'sources': [
+        '../tools/skpmaker.cpp',
+      ],
+      'include_dirs': [
+        '../src/core',
+      ],
+      'dependencies': [
+        'flags.gyp:flags',
+        'skia_lib.gyp:skia_lib',
+      ],
+    },
+    {
       'target_name': 'skimagediff',
       'type': 'executable',
       'sources': [
         '../tools/skdiff.cpp',
         '../tools/skdiff.h',
         '../tools/skdiff_html.cpp',
         '../tools/skdiff_html.h',
         '../tools/skdiff_image.cpp',
         '../tools/skdiff_utils.cpp',
         '../tools/skdiff_utils.h',
@@ skipping 368 matching lines @@
             'type': 'executable',
             'sources': [
               '../tools/win_lcid.cpp',
             ],
           },
         ],
       },
     ],
   ],
 }