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 d0855c9430afe8de5ac33dbaf67ff97406e5b5a4..efcfb7f216a13f025bd619f7a5ce5cc2ca87bf8a 100644
--- a/skia/BUILD.gn
+++ b/skia/BUILD.gn
@@ -547,8 +547,13 @@ 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" ]
       }
@@ -564,7 +569,10 @@ 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",