Support for OpenType Font Variations on Windows

skia/BUILD.gn

Index: skia/BUILD.gn
diff --git a/skia/BUILD.gn b/skia/BUILD.gn
index df0f01764306642c39a8a56812f1a55745deec22..a6c38df052639fc47e2b146aaa5053de60cda11a 100644
--- a/skia/BUILD.gn
+++ b/skia/BUILD.gn
@@ -43,6 +43,10 @@ config("skia_config") {
 
   defines = skia_for_chromium_defines
 
+  if (is_win) {
+    defines += [ "SK_FREETYPE_MINIMUM_RUNTIME_VERSION=(((FREETYPE_MAJOR) << 24) | ((FREETYPE_MINOR) << 16) | ((FREETYPE_PATCH) << 8))" ]
+  }
+
   if (is_component_build) {
     defines += [
       "SKIA_DLL",
@@ -358,9 +362,6 @@ component("skia") {
 
   if (is_linux || is_android) {
     sources += [
-      "//third_party/skia/src/ports/SkFontHost_FreeType.cpp",
-      "//third_party/skia/src/ports/SkFontHost_FreeType_common.cpp",
-
       # Retain the files for the SkFontMgr_Android on linux to emulate android
       # fonts. See content/zygote/zygote_main_linux.cc
       # Note that this requires expat.
@@ -369,9 +370,22 @@ component("skia") {
     ]
   }
 
-  # Select the right BitmapPlatformDevice.
+  if (is_linux || is_android || is_win) {
+    sources += [
+      "//third_party/skia/src/ports/SkFontHost_FreeType.cpp",
+      "//third_party/skia/src/ports/SkFontHost_FreeType_common.cpp",
+    ]
+  }
+
   if (is_win) {
-    sources += [ "ext/raster_handle_allocator_win.cc" ]
+    sources += [
+      # Add the custom FreeType font manager to instantiate variable fonts on Windows.
+      "//third_party/skia/src/ports/SkFontMgr_custom.cpp",
+      "//third_party/skia/src/ports/SkFontMgr_custom_empty.cpp",
+
+      # Select the right BitmapPlatformDevice.
+      "ext/raster_handle_allocator_win.cc",
+    ]
   }
 
   if (is_clang && !is_nacl) {
@@ -400,8 +414,8 @@ component("skia") {
       configs += [ "//build/config/linux/pangocairo" ]
     }
     deps += [
-      "//build/linux:fontconfig",
       "//build/config/freetype",
+      "//build/linux:fontconfig",
       "//third_party/expat",
       "//third_party/icu:icuuc",
     ]
@@ -411,10 +425,13 @@ component("skia") {
     deps += [
       "//third_party/android_tools:cpu_features",
       "//third_party/expat",
-      "//build/config/freetype",
     ]
   }
 
+  if (is_win || is_android) {
+    deps += [ "//build/config/freetype" ]
+  }
+
   if (skia_support_pdf) {
     deps += [
       "//third_party/sfntly",