Vulkan config in dm

dm/DMGpuSupport.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef DMGpuSupport_DEFINED
 #define DMGpuSupport_DEFINED
 
@@ skipping 62 matching lines @@
 
     static const ContextType kANGLE_ContextType         = 0,
                              kANGLE_GL_ContextType      = 0,
                              kCommandBuffer_ContextType = 0,
                              kDebugGL_ContextType       = 0,
                              kMESA_ContextType          = 0,
                              kNVPR_ContextType          = 0,
                              kNativeGL_ContextType      = 0,
                              kGL_ContextType            = 0,
                              kGLES_ContextType          = 0,
-                             kNullGL_ContextType        = 0;
+                             kNullGL_ContextType        = 0,
+                             kVulkan_ContextType        = 0;
     static const int kContextTypeCnt = 1;
     enum ContextOptions {
         kNone_ContextOptions = 0,
         kEnableNVPR_ContextOptions = 0x1,
     };
     void destroyContexts() {}
 
     void abandonContexts() {}
 
     void releaseResourcesAndAbandonContexts() {}
@@ skipping 11 matching lines @@
                                        int,
                                        bool) {
     return nullptr;
 }
 
 }  // namespace DM
 
 #endif//SK_SUPPORT_GPU
 
 #endif//DMGpuSupport_DEFINED