Add gyp support for new GPU backend

gyp/common.gypi

 # Copyright 2011 The Android Open Source Project
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 # This file is automatically included by gyp_skia when building any target.
 
 {
   'includes': [
     'common_variables.gypi',
@@ skipping 45 matching lines @@
       [ 'skia_angle', {
         'defines': [
           'SK_ANGLE',
         ],
         'direct_dependent_settings': {
           'defines': [
             'SK_ANGLE',
           ],
         },
       }],
+      [ 'skia_vulkan', {
+        'defines': [
+          'SK_VULKAN',
+        ],
+        'direct_dependent_settings': {
+          'defines': [
+            'SK_VULKAN',
+          ],
+        },
+      }],
       [ 'skia_win_debuggers_path and skia_os == "win"',
         {
           'defines': [
             'SK_USE_CDB',
           ],
         },
       ],
       [ 'skia_android_framework==0', {
         # These defines are not used for skia_android_framework, where we build
         # one makefile and allow someone to add SK_DEBUG etc for their own
         # debugging purposes.
         'configurations': {
           'Debug':   { 'defines': [ 'SK_DEVELOPER=1' ] },
           'Release': { 'defines': [ 'NDEBUG' ] },
           'Release_Developer': {
             'inherit_from': ['Release'],
             'defines': [ 'SK_DEVELOPER=1' ],
           },
         },
       }],
     ],
   }, # end 'target_defaults'
 }