Added tool for reference less video analysis

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 62e06ad4ac9804dd364ca41f81dd531d3f738daa..1f8e0d891c84f0b1e03e152afb6c81a2a60ad88d 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -19,3 +19,14 @@ group("default") {
     deps += [ "//webrtc:webrtc_tests" ]
   }
 }
+
+# This needs to be on the top-level to avoid violating the PRESUBMIT rule that
+# disallows including sources in higher-level directory levels.
+rtc_source_set("libvpx_y4minput") {

[phoglund, 2016/12/02 09:51:41]

I'm not sure about the decision to create a rule reaching into libvpx code at
the top level. I thought we tried to not do that, and blaze will certainly not
allow that kind of going past package boundaries.

Shouldn't that be in the libvpx gn file in that case?

[kjellander_webrtc, 2016/12/02 09:58:06]

Patrik you're right. My obsession with not duplicating code is going to far here
:)
I suggest we drop this and go back to Charu's original implementation instead.
Sorry about all the extra work - we shouldn't introduce all this extra
uncertainty for that tiny function.

+  sources = [
+    "third_party/libvpx/source/libvpx/y4minput.c",
+  ]
+  deps = [
+    "//third_party/libvpx",
+  ]
+}