Reduce full stack test time to 45 secs and add H264 and FlexFEC.

webrtc/BUILD.gn

Index: webrtc/BUILD.gn
diff --git a/webrtc/BUILD.gn b/webrtc/BUILD.gn
index 2becbc74ea9d5a03a0cb5c9a98908043076d3319..1d14c906f311db4c3c55a643590538d34219190b 100644
--- a/webrtc/BUILD.gn
+++ b/webrtc/BUILD.gn
@@ -611,7 +611,6 @@ if (rtc_include_tests) {
       deps += [ "//testing/android/native_test:native_test_native_code" ]
       shard_timeout = 900
     }
-
     if (is_ios) {
       deps += [ ":video_engine_tests_bundle_data" ]
     }
@@ -689,6 +688,9 @@ if (rtc_include_tests) {
       # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
+    if (rtc_use_h264) {
+      defines += [ "WEBRTC_USE_H264" ]
+    }
   }
 
   rtc_test("webrtc_nonparallel_tests") {