Add libflac and speex to the GN build.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index febc47a31567dd6c704213142469e3d05509156a..16f0c42819bf25b6a09de0253500b8e952008bb6 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -60,6 +60,7 @@ group("root") {
     "//sql",
     "//third_party/angle:translator",
     "//third_party/brotli",
+    "//third_party/flac",
     "//third_party/harfbuzz-ng",
     "//third_party/iccjpeg",
     "//third_party/icu",
@@ -77,6 +78,7 @@ group("root") {
     "//third_party/smhasher:cityhash",
     "//third_party/smhasher:murmurhash3",
     "//third_party/smhasher:pmurhash",
+    "//third_party/speex",

[tfarina, 2014/06/13 19:11:49]

I said on my Snippets I was going to hook it up. OK, that is fine. 

Thanks!

[brettw, 2014/06/13 23:36:25]

Whoops sorry! I was just blindly going through deps I needed for content. Looks
like we just need to roll deps on speex and then your file will start working
and we can delete mine.

     "//third_party/WebKit/public:blink_headers",
     "//third_party/WebKit/Source/wtf",
     "//third_party/zlib",