Cast: Fix threading issues in VideoEncoderImpl

media/cast/test/encode_decode_test.cc

Index: media/cast/test/encode_decode_test.cc
diff --git a/media/cast/test/encode_decode_test.cc b/media/cast/test/encode_decode_test.cc
index 1d5fe567254b825b84e1059c11e0997f1fedbc4c..dfaf4a4ca46885c33aba123c7efda946d8eba2cb 100644
--- a/media/cast/test/encode_decode_test.cc
+++ b/media/cast/test/encode_decode_test.cc
@@ -122,6 +122,7 @@ class EncodeDecodeTest : public ::testing::Test {
 
 TEST_F(EncodeDecodeTest, BasicEncodeDecode) {
   transport::EncodedVideoFrame encoded_frame;
+  encoder_->Initialize();
   // Encode frame.
   encoder_->Encode(video_frame_, &encoded_frame);
   EXPECT_GT(encoded_frame.data.size(), GG_UINT64_C(0));