Add an HD resolution perf test.

Also update existing perf tests to use send side bwe.

BUG=webrtc:4604, chromium:522001

Review-Url: https://codereview.webrtc.org/2227733004
Cr-Commit-Position: refs/heads/master@{#13726}
diff --git a/webrtc/webrtc_perf_tests.isolate b/webrtc/webrtc_perf_tests.isolate
index b66054c..7d58fd6 100644
--- a/webrtc/webrtc_perf_tests.isolate
+++ b/webrtc/webrtc_perf_tests.isolate
@@ -12,6 +12,7 @@
         'files': [
           '<(DEPTH)/resources/audio_coding/speech_mono_16kHz.pcm',
           '<(DEPTH)/resources/audio_coding/testfile32kHz.pcm',
+          '<(DEPTH)/resources/ConferenceMotion_1280_720_50.yuv',
           '<(DEPTH)/resources/foreman_cif.yuv',
           '<(DEPTH)/resources/paris_qcif.yuv',
           '<(DEPTH)/resources/voice_engine/audio_long16.pcm',