Allow GMs ato be used as benchmarks. Make convex_poly_clip opt in.

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 12 matching lines @@
           '../gm/',
         ],
       },
     },
     {
       'target_name': 'gm',
       'type': 'executable',
       'include_dirs' : [
         '../src/core',
         '../src/images',
-        '../src/lazy',
         '../src/effects',
         '../src/pipe/utils/',
         '../src/utils/',
-        '../src/utils/debugger',
       ],
       'includes': [
         'gmslides.gypi',
       ],
       'sources': [
-        '../gm/gm.cpp',
         '../gm/gmmain.cpp',
         '../gm/system_preferences_default.cpp',
 
         '../src/pipe/utils/SamplePipeControllers.h',
         '../src/pipe/utils/SamplePipeControllers.cpp',
-
-        '../src/utils/debugger/SkDrawCommand.h',
-        '../src/utils/debugger/SkDrawCommand.cpp',
-        '../src/utils/debugger/SkDebugCanvas.h',
-        '../src/utils/debugger/SkDebugCanvas.cpp',
-        '../src/utils/debugger/SkObjectParser.h',
-        '../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_run_pdfviewer_in_gm or skia_poppler_enabled', {
@@ skipping 44 matching lines @@
             '../src/gpu',
           ],
           'dependencies': [
             'gputest.gyp:skgputest',
           ],
         }],
       ],
     },
   ],
 }