Added tool for reference less video analysis

BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("webrtc/build/webrtc.gni")
 
 group("default") {
   testonly = true
   deps = [
     "//webrtc",
     "//webrtc/examples",
     "//webrtc/tools",
   ]
   if (rtc_include_tests) {
     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",
+  ]
+}