Disable flaky TestVp9Impl.EncodeDecode for iOS.

webrtc/modules/video_coding/codecs/vp9/test/vp9_impl_unittest.cc

 /*
  *  Copyright (c) 2017 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.
  */
 
@@ skipping 11 matching lines @@
 
   VideoCodec codec_settings() override {
     VideoCodec codec_inst;
     codec_inst.codecType = webrtc::kVideoCodecVP9;
     codec_inst.VP9()->numberOfTemporalLayers = 1;
     codec_inst.VP9()->numberOfSpatialLayers = 1;
     return codec_inst;
   }
 };
 
+// Disabled on ios as flake, see https://crbug.com/webrtc/7057
+#if defined(WEBRTC_IOS)
+TEST_F(TestVp9Impl, DISABLED_EncodeDecode) {
+#else
 TEST_F(TestVp9Impl, EncodeDecode) {
+#endif
   EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK,
             encoder_->Encode(*input_frame_, nullptr, nullptr));
   EncodedImage encoded_frame;
   ASSERT_TRUE(WaitForEncodedFrame(&encoded_frame));
   // First frame should be a key frame.
   encoded_frame._frameType = kVideoFrameKey;
   EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK,
             decoder_->Decode(encoded_frame, false, nullptr));
   std::unique_ptr<VideoFrame> decoded_frame;
   rtc::Optional<uint8_t> decoded_qp;
@@ skipping 13 matching lines @@
             decoder_->Decode(encoded_frame, false, nullptr));
   std::unique_ptr<VideoFrame> decoded_frame;
   rtc::Optional<uint8_t> decoded_qp;
   ASSERT_TRUE(WaitForDecodedFrame(&decoded_frame, &decoded_qp));
   ASSERT_TRUE(decoded_frame);
   ASSERT_TRUE(decoded_qp);
   EXPECT_EQ(encoded_frame.qp_, *decoded_qp);
 }
 
 }  // namespace webrtc