libvpx: Pull from upstream

source/libvpx/test/encode_test_driver.h

Index: source/libvpx/test/encode_test_driver.h
diff --git a/source/libvpx/test/encode_test_driver.h b/source/libvpx/test/encode_test_driver.h
index 765c7d164652202a8754eee2515ba7e9392142fc..7b7dd31606f5aac50354adb0af935b18bea7a06a 100644
--- a/source/libvpx/test/encode_test_driver.h
+++ b/source/libvpx/test/encode_test_driver.h
@@ -140,6 +140,12 @@ class Encoder {
   }
 #endif
 
+  void Config(const vpx_codec_enc_cfg_t *cfg) {
+    const vpx_codec_err_t res = vpx_codec_enc_config_set(&encoder_, cfg);
+    ASSERT_EQ(VPX_CODEC_OK, res) << EncoderError();
+    cfg_ = *cfg;
+  }
+
   void set_deadline(unsigned long deadline) {
     deadline_ = deadline;
   }