Update Windows build to use VULKAN_SDK rather than VK_SDK_PATH

infra/bots/recipe_modules/flavor/default_flavor.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 
 # pylint: disable=W0201
 
 
 """Default flavor utils class, used for desktop builders."""
 
@@ skipping 121 matching lines @@
   def compile(self, target, **kwargs):
     """Build the given target."""
     env = kwargs.pop('env', {})
     # The CHROME_PATH environment variable is needed for builders that use
     # toolchains downloaded by Chrome.
     env['CHROME_PATH'] = self.chrome_path
     if self.m.platform.is_win:
       make_cmd = ['python', 'make.py']
       self.m.run.run_once(self.bootstrap_win_toolchain)
       if 'Vulkan' in self.m.vars.builder_name:
-        env['VK_SDK_PATH'] = self.m.vars.slave_dir.join('win_vulkan_sdk')
+        env['VULKAN_SDK'] = self.m.vars.slave_dir.join('win_vulkan_sdk')
     else:
       make_cmd = ['make']
     cmd = make_cmd + [target]
     try:
       self.m.run(self.m.step, 'build %s' % target, cmd=cmd,
                  env=env, cwd=self.m.path['checkout'], **kwargs)
     except self.m.step.StepFailure:
       if self.m.platform.is_win:
         # The linker occasionally crashes on Windows. Try again.
         self.m.run(self.m.step, 'build %s' % target, cmd=cmd,
@@ skipping 72 matching lines @@
         perf_data_dir=self.m.vars.perf_data_dir,
         resource_dir=self.m.vars.resource_dir,
         images_dir=self.m.vars.images_dir,
         skp_dir=self.m.vars.local_skp_dir,
         svg_dir=self.m.vars.local_svg_dir,
         tmp_dir=self.m.vars.tmp_dir)
 
   def cleanup_steps(self):
     """Run any device-specific cleanup steps."""
     pass