Move SkGLContext and some GrGLInterface implementations to skgputest module

gyp/kilobench.gyp

 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 # GYP file to build performance testbench.
 #
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
     {
       'target_name': 'kilobench',
       'type': 'executable',
       'include_dirs': [
         '../bench',
         '../gm',
         '../include/private',
         '../src/core',
+        '../src/gpu',
         '../tools/VisualBench',
       ],
       'sources': [ 
         '<!@(python find.py ../tools/kilobench "*.cpp")',
         '../bench/Benchmark.cpp',
         '../tools/VisualBench/VisualSKPBench.cpp',
       ],
       'dependencies': [
         'flags.gyp:flags',
+        'gpu.gyp:skgpu',
         'gputest.gyp:skgputest',
         'jsoncpp.gyp:jsoncpp',
         'skia_lib.gyp:skia_lib',
         'tools.gyp:crash_handler',
         'tools.gyp:proc_stats',
         'tools.gyp:resources',
         'tools.gyp:timer',
       ],
     },
   ],
 }