Report minimum PSNR in VideoQualityTest and save corresponding frame to file

BUG=none

Review-Url: https://codereview.webrtc.org/2976373002
Cr-Commit-Position: refs/heads/master@{#19130}

webrtc/video/BUILD.gn

diff --git a/webrtc/video/BUILD.gn b/webrtc/video/BUILD.gn
index 990a7ae..77ba8e9 100644
--- a/webrtc/video/BUILD.gn
+++ b/webrtc/video/BUILD.gn
@@ -110,6 +110,7 @@
       "../test:test_renderer",
       "../test:test_support",
       "../test:video_test_common",
+      "../test:video_test_support",
       "../voice_engine",
       "//testing/gtest",
       "//webrtc/test:rtp_test_utils",