Stub out Skia AVX and HSW opts.

skia/BUILD.gn

Index: skia/BUILD.gn
diff --git a/skia/BUILD.gn b/skia/BUILD.gn
index c0e296e5fa2f5b3cec2d49e617db10f37f28bdce..55854ffe660126c63c7761eee4a9d80bec546daf 100644
--- a/skia/BUILD.gn
+++ b/skia/BUILD.gn
@@ -548,8 +548,13 @@ if (!skia_build_no_opts) {
         "//build/config/compiler:no_chromium_code",
       ]
     }
+
+    # skia_opts_avx and skia_opts_hsw are stubbed out for crbug.com/666707.
     source_set("skia_opts_avx") {
-      sources = skia_opts.avx_sources
+      #sources = skia_opts.avx_sources
+      sources = [
+        "ext/SkOpts_avx_stub.cc",
+      ]
       if (!is_win) {
         cflags = [ "-mavx" ]
       }
@@ -565,7 +570,10 @@ if (!skia_build_no_opts) {
       ]
     }
     source_set("skia_opts_hsw") {
-      sources = skia_opts.hsw_sources
+      #sources = skia_opts.hsw_sources
+      sources = [
+        "ext/SkOpts_hsw_stub.cc",
+      ]
       if (!is_win) {
         cflags = [
           "-mavx2",