Piggybacking simulcast id and ALR experiment id into video content type extension.

webrtc/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.
 
 # TODO(kjellander): Rebase this to webrtc/build/common.gypi changes after r6330.
 
@@ skipping 342 matching lines @@
   # webrtc_common
   check_includes = false
   sources = [
     "common_types.cc",
     "common_types.h",
     "config.cc",
     "config.h",
     "typedefs.h",
   ]
 
+  # This is needed here  because common_types.cc uses VideoContentType, which
+  # needs .cc file to be compiled. This is public to allow include of
+  # video_content_type.h.
+  public_deps = [
+    "api:video_content_type_api",
+  ]
+
   if (!build_with_chromium && is_clang) {
     # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
     suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
   }
 }
 
 if (use_libfuzzer || use_drfuzz || use_afl) {
   # This target is only here for gn to discover fuzzer build targets under
   # webrtc/test/fuzzers/.
   group("webrtc_fuzzers_dummy") {
@@ skipping 170 matching lines @@
       ]
 
       deps = [
         "examples:AppRTCMobile_javalib",
         "sdk/android:libjingle_peerconnection_java",
         "//base:base_java_test_support",
       ]
     }
   }
 }