In screenshare mode, suppress VP8 bitrate overshoot and increase quality

webrtc/video/screenshare_loopback.cc

Index: webrtc/video/screenshare_loopback.cc
diff --git a/webrtc/video/screenshare_loopback.cc b/webrtc/video/screenshare_loopback.cc
index c0f96d4ff8f045bc59d6a3af28381512bee55c8b..f2133a211b8a947fbcecb543c103561e3cdef8cd 100644
--- a/webrtc/video/screenshare_loopback.cc
+++ b/webrtc/video/screenshare_loopback.cc
@@ -45,12 +45,12 @@ size_t MinBitrate() {
   return static_cast<size_t>(FLAGS_min_bitrate);
 }
 
-DEFINE_int32(tl0_bitrate, 100, "Temporal layer 0 target bitrate.");
+DEFINE_int32(tl0_bitrate, 200, "Temporal layer 0 target bitrate.");
 size_t StartBitrate() {
   return static_cast<size_t>(FLAGS_tl0_bitrate);
 }
 
-DEFINE_int32(tl1_bitrate, 1000, "Temporal layer 1 target bitrate.");
+DEFINE_int32(tl1_bitrate, 2000, "Temporal layer 1 target bitrate.");
 size_t MaxBitrate() {
   return static_cast<size_t>(FLAGS_tl1_bitrate);
 }