Move SkGLContext and some GrGLInterface implementations to skgputest module

gyp/SampleApp.gyp

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 {
   'targets': [
     {
       'target_name': 'SampleApp',
       'type': 'executable',
@@ skipping 135 matching lines @@
       ],
       'dependencies': [
         'animator.gyp:animator',
         'etc1.gyp:libetc1',
         'experimental.gyp:experimental',
         'flags.gyp:flags',
         'jsoncpp.gyp:jsoncpp',
         'lua.gyp:lua',
         'pdf.gyp:pdf',
         'skia_lib.gyp:skia_lib',
+        'gputest.gyp:skgputest',
         'tools.gyp:resources',
         'tools.gyp:sk_tool_utils',
         'tools.gyp:timer',
         'tools.gyp:url_data_manager',
         'views.gyp:views',
         'xml.gyp:xml',
       ],
       'msvs_settings': {
         'VCLinkerTool': {
           #Allows for creation / output to console.
@@ skipping 101 matching lines @@
           ],
         }],
         [ 'not skia_pdf', {
           'dependencies!': [ 'pdf.gyp:pdf' ],
           'dependencies': [ 'pdf.gyp:nopdf' ],
         }],
       ],
     },
   ],
 }