Compile Vulkan when building for the Android framework.

gyp/shaderc.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.
 
 # Builds shaderc for the Vulkan backend
 {
   'targets': [
     {
       'target_name': 'shaderc_combined',
       'type': 'static_library',
       'dependencies': [
         'libshaderc',
         'libshaderc_util',
         'liboglcompiler',
         'libspirv',
         'libglslangosdependent',
         'libglslang',
       ],
+      'direct_dependent_settings': {
+        'include_dirs': [
+          '../third_party/externals/shaderc2/libshaderc/include',
+        ],
+      },
     },
     {
       'target_name': 'libshaderc',
       'type': 'static_library',
       'cflags': [
         '-w',
       ],
       'xcode_settings': {
         'WARNING_CFLAGS': [
           '-w'
@@ skipping 299 matching lines @@
             '--extinst-opencl-grammar',
             '../third_party/externals/shaderc2/third_party/spirv-tools/source/extinst-1-0.opencl.std.grammar.json',
             '--opencl-insts-output',
             '../third_party/externals/shaderc2/third_party/spirv-tools/source/opencl.std.insts-1-0.inc'
           ],
         },
       ],
     },
   ],
 }