Expose ECT to render frames, Blink and NetInfo

content/common/renderer.mojom

Index: content/common/renderer.mojom
diff --git a/content/common/renderer.mojom b/content/common/renderer.mojom
index dbdd196714cf3a07e6a23cabca36d3c2be2650f5..4ab29c1dfd33e77fdd5601b6c32f4f609c0a0f07 100644
--- a/content/common/renderer.mojom
+++ b/content/common/renderer.mojom
@@ -159,11 +159,14 @@ interface Renderer {
                              double max_bandwidth_mbps);
 
   // Tells the renderer process that the network quality estimate has changed.
+  // EffectiveConnectionType is the connection type whose typical performance is
+  // most similar to the measured performance of the network in use.
   // The downstream throughput is computed in kilobits per second. If an
   // estimate of the HTTP or transport RTT is unavailable, it will be set to 
   // net::nqe::internal::InvalidRTT(). If the throughput estimate is
   // unavailable, it will be set to net::nqe::internal::kInvalidThroughput.
-  OnNetworkQualityChanged(mojo.common.mojom.TimeDelta http_rtt,
+  OnNetworkQualityChanged(EffectiveConnectionType effective_connection_type,
+                          mojo.common.mojom.TimeDelta http_rtt,
                           mojo.common.mojom.TimeDelta transport_rtt,
                           double bandwidth_kbps);