Merge from Chromium at DEPS revision 278856

This commit was generated by merge_to_master.py.

Change-Id: If3807744d3e5d3ee84b897bd2d099a2b7ed2e7a3
diff --git a/net/net_derived_sources.target.darwin-arm64.mk b/net/net_derived_sources.target.darwin-arm64.mk
index e4d4f1e..c48634d 100644
--- a/net/net_derived_sources.target.darwin-arm64.mk
+++ b/net/net_derived_sources.target.darwin-arm64.mk
@@ -153,6 +153,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DUSE_OPENSSL=1' \
 	'-DUSE_OPENSSL_CERTS=1' \
@@ -239,6 +240,7 @@
 	'-DDATA_REDUCTION_DEV_HOST="http://proxy-dev.googlezip.net:80/"' \
 	'-DSPDY_PROXY_AUTH_ORIGIN="https://proxy.googlezip.net:443/"' \
 	'-DDATA_REDUCTION_PROXY_PROBE_URL="http://check.googlezip.net/connect"' \
+	'-DDATA_REDUCTION_PROXY_WARMUP_URL="http://www.gstatic.com/generate_204"' \
 	'-DVIDEO_HOLE=1' \
 	'-DUSE_OPENSSL=1' \
 	'-DUSE_OPENSSL_CERTS=1' \