Revert of Pull and build shaderc rather than use checked in lib/header

gyp/gpu.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.
 # GYP for building gpu
 {
   'target_defaults': {
     'conditions': [
       ['skia_os != "win"', {
         'sources/': [ ['exclude', '_win.(h|cpp)$'],
@@ skipping 217 matching lines @@
             'GR_GL_USE_NEW_SHADER_SOURCE_SIGNATURE=1',
           ],
           'link_settings': {
             'libraries': [
               '-lGLESv2',
               '-lEGL',
             ],
           },
         }],
         [ 'skia_vulkan', {
-          'dependencies': [
-            'shaderc.gyp:shaderc_combined',
-          ],
           'include_dirs': [
-            '../third_party/', # To include files under third_party/vulkan
-            '../third_party/externals/shaderc/libshaderc/include',
+            '../third_party/' # To include files under third_party/vulkan
           ],
           'direct_dependent_settings': {
             'include_dirs': [
-              '../third_party/', # To include files under third_party/vulkan
-              '../third_party/externals/shaderc/libshaderc/include',
+              '../third_party/' # To include files under third_party/vulkan
             ],
           },
           'conditions' : [
             ['skia_os == "win"', {
               'all_dependent_settings': {
                 'msvs_settings': {
                   'VCLinkerTool': {
                     'AdditionalDependencies': [
                       'vulkan-1.lib',
+                      'shaderc_combined.lib'
                     ],
                   },
                 },
               },
               'link_settings': {
                 'configurations': {
                   'Debug': {
                     'msvs_settings': {
                       'VCLinkerTool': {
                       'AdditionalLibraryDirectories': [
                           '../third_party/vulkan',
+                          '../third_party/shaderc/Debug',
                         ],
                       },
                     },
                   },
                   'Release': {
                     'msvs_settings': {
                       'VCLinkerTool': {
                         'AdditionalLibraryDirectories': [
                           '../third_party/vulkan',
+                          '../third_party/shaderc/Release',
                         ],
                       },
                     },
                   },
                   'Debug_x64': {
                     'msvs_settings': {
                       'VCLinkerTool': {
                         'AdditionalLibraryDirectories': [
                           '../third_party/vulkan',
+                          '../third_party/shaderc/Debug',
                         ],
                       },
                     },
                   },
                   'Release_x64': {
                       'msvs_settings': {
                       'VCLinkerTool': {
                         'AdditionalLibraryDirectories': [
                           '../third_party/vulkan',
+                          '../third_party/shaderc/Release',
                         ],
                       },
                     },
                   },
                 },
               },
             }],
           ],
         }, {
           'sources!': [
             '<@(skgpu_vk_sources)',
           ],
         }],
       ],
     },
   ],
 }