Expose RTT and throughput estimates from Cronet

components/cronet/android/api/src/org/chromium/net/CronetEngine.java

Index: components/cronet/android/api/src/org/chromium/net/CronetEngine.java
diff --git a/components/cronet/android/api/src/org/chromium/net/CronetEngine.java b/components/cronet/android/api/src/org/chromium/net/CronetEngine.java
index e386b670818795ac45ad4087aafae7d93410e0ff..ee84537b78418585dac8debb87b37ff6d6837d89 100644
--- a/components/cronet/android/api/src/org/chromium/net/CronetEngine.java
+++ b/components/cronet/android/api/src/org/chromium/net/CronetEngine.java
@@ -780,6 +780,12 @@ public abstract class CronetEngine {
         }
     }
 
+    /**
+     * Value used for RTT and throughput estimates if a valid value is unavailable.
+     */
+    public static final int INVALID_RTT_THROUGHPUT =
+            RttThroughputValues.INVALID_RTT_THROUGHPUT_VALUE;
+
     private static final String TAG = "UrlRequestFactory";
     private static final String CRONET_URL_REQUEST_CONTEXT =
             "org.chromium.net.impl.CronetUrlRequestContext";
@@ -993,6 +999,39 @@ public abstract class CronetEngine {
     public abstract int getEffectiveConnectionType();
 
     /**
+     * Returns the HTTP RTT estimate (in milliseconds) computed by the network
+     * quality estimator. Set to {@link INVALID_RTT_THROUGHPUT} if a valid value
+     * is unavailable. This must be called after
+     * {@link #enableNetworkQualityEstimator}, and will throw an
+     * exception otherwise.
+     * @hide as it's a prototype.
+     * @return Estimate of the HTTP RTT in milliseconds.
+     */
+    public abstract int getHttpRttMs();
+
+    /**
+     * Returns the transport RTT estimate (in milliseconds) computed by the
+     * network quality estimator. Set to {@link INVALID_RTT_THROUGHPUT} if a
+     * valid value is unavailable.  This must be called after
+     * {@link #enableNetworkQualityEstimator}, and will throw an
+     * exception otherwise.
+     * @hide as it's a prototype.
+     * @return Estimate of the transport RTT in milliseconds.
+     */
+    public abstract int getTransportRttMs();
+
+    /**
+     * Returns the downstream throughput estimate (in kilobits per second)
+     * computed by the network quality estimator. Set to
+     * {@link INVALID_RTT_THROUGHPUT} if a valid value is unavailable.  This
+     * must be called after {@link #enableNetworkQualityEstimator}, and will
+     * throw an exception otherwise.
+     * @hide as it's a prototype.
+     * @return Estimate of the downstream throughput in kilobits per second.
+     */
+    public abstract int getDownstreamThroughputKbps();
+
+    /**
      * Configures the network quality estimator for testing. This must be called
      * before round trip time and throughput listeners are added, and after the
      * network quality estimator has been enabled.