GN: Android Vulkan support

BUILD.gn

 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("gn/shared_sources.gni")
 
 declare_args() {
   skia_enable_tools = !is_fuchsia && !is_component_build
 
   skia_use_expat = true
   skia_use_fontconfig = is_linux
   skia_use_freetype = is_android || is_fuchsia || is_linux
   skia_use_giflib = !is_fuchsia
   skia_use_libjpeg_turbo = true
   skia_use_libpng = true
   skia_use_libwebp = !is_fuchsia
   skia_use_sfntly = !is_fuchsia
+  skia_use_vulkan = false
   skia_use_zlib = true
 }
 
 fontmgr_android_enabled = skia_use_expat && skia_use_freetype
 
 skia_public_includes = [
   "include/android",
   "include/c",
   "include/codec",
   "include/config",
@@ skipping 169 matching lines @@
       all_dependent_configs = [ ":" + target_name + "_public" ]
       configs += skia_library_configs
     }
   } else {
     source_set(target_name) {
       forward_variables_from(invoker,
                              "*",
                              [
                                "public_defines",
                                "deps",
+                               "libs",
                                "sources",
                                "sources_when_disabled",
                              ])
       if (defined(invoker.sources_when_disabled)) {
         sources = invoker.sources_when_disabled
       }
       configs += skia_library_configs
     }
   }
 }
@@ skipping 114 matching lines @@
 
   deps = [
     "//third_party/freetype2",
   ]
   sources = [
     "src/ports/SkFontHost_FreeType.cpp",
     "src/ports/SkFontHost_FreeType_common.cpp",
   ]
 }
 
+optional("vulkan") {
+  enabled = skia_use_vulkan
+  public_defines = [ "SK_VULKAN" ]
+  libs = [ "vulkan" ]
+  sources = skia_vk_sources
+}
+
 optional("webp") {
   enabled = skia_use_libwebp
   public_defines = [ "SK_HAS_WEBP_LIBRARY" ]
 
   deps = [
     "//third_party/libwebp",
   ]
   sources = [
     "src/codec/SkWebpAdapterCodec.cpp",
     "src/codec/SkWebpCodec.cpp",
@@ skipping 31 matching lines @@
     ":gif",
     ":jpeg",
     ":none",
     ":pdf",
     ":png",
     ":sse2",
     ":sse41",
     ":sse42",
     ":ssse3",
     ":typeface_freetype",
+    ":vulkan",
     ":webp",
     ":xml",
   ]
 
   sources = []
   sources += skia_core_sources
   sources += skia_effects_sources
   sources += skia_gpu_sources
   sources += skia_sksl_sources
   sources += skia_utils_sources
@@ skipping 191 matching lines @@
     ]
     libs = []
 
     if (is_android) {
       sources += [ "tools/gpu/gl/egl/CreatePlatformGLTestContext_egl.cpp" ]
     } else if (is_linux) {
       sources += [ "tools/gpu/gl/glx/CreatePlatformGLTestContext_glx.cpp" ]
     } else if (is_mac) {
       sources += [ "tools/gpu/gl/mac/CreatePlatformGLTestContext_mac.cpp" ]
     }
+
+    if (skia_use_vulkan) {
+      sources += [ "tools/gpu/vk/VkTestContext.cpp" ]
+    }
   }
 
   test_lib("flags") {
     public_include_dirs = [ "tools/flags" ]
     sources = [
       "tools/flags/SkCommandLineFlags.cpp",
       "tools/flags/SkCommonFlags.cpp",
       "tools/flags/SkCommonFlagsConfig.cpp",
     ]
     deps = [
@@ skipping 199 matching lines @@
     sources = [
       "tools/SkShaper_primitive.cpp",
       "tools/using_skia_and_harfbuzz.cpp",
     ]
     deps = [
       ":skia",
     ]
     testonly = true
   }
 }