Expose RTT and throughput estimates from Cronet

components/cronet/android/java/src/org/chromium/net/impl/CronetUrlRequestContext.java

Index: components/cronet/android/java/src/org/chromium/net/impl/CronetUrlRequestContext.java
diff --git a/components/cronet/android/java/src/org/chromium/net/impl/CronetUrlRequestContext.java b/components/cronet/android/java/src/org/chromium/net/impl/CronetUrlRequestContext.java
index 819347d57a1cad185362e7e0315d0afc3d09fe71..10fbde424531accd824fa85c6b3eff533ac81914 100644
--- a/components/cronet/android/java/src/org/chromium/net/impl/CronetUrlRequestContext.java
+++ b/components/cronet/android/java/src/org/chromium/net/impl/CronetUrlRequestContext.java
@@ -24,6 +24,7 @@ import org.chromium.net.EffectiveConnectionType;
 import org.chromium.net.NetworkQualityRttListener;
 import org.chromium.net.NetworkQualityThroughputListener;
 import org.chromium.net.RequestFinishedInfo;
+import org.chromium.net.RttThroughputValues;
 import org.chromium.net.UrlRequest;
 import org.chromium.net.urlconnection.CronetHttpURLConnection;
 import org.chromium.net.urlconnection.CronetURLStreamHandlerFactory;
@@ -92,8 +93,30 @@ public class CronetUrlRequestContext extends CronetEngine {
      * estimator.
      */
     @GuardedBy("mNetworkQualityLock")
+    @EffectiveConnectionType

[xunjieli, 2016/10/20 01:02:43]

From the build output, this doesn't seem to work for some reason. I think we can
leave it alone and revert it since it's not related to this CL.

[tbansal1, 2016/10/20 01:05:53]

Done in PS#7.

     private int mEffectiveConnectionType = EffectiveConnectionType.TYPE_UNKNOWN;
 
+    /**
+     * Current estimate of the HTTP RTT (in milliseconds) computed by the
+     * network quality estimator.
+     */
+    @GuardedBy("mNetworkQualityLock")
+    private int mHttpRttMs = RttThroughputValues.INVALID_RTT_THROUGHPUT;
+
+    /**
+     * Current estimate of the transport RTT (in milliseconds) computed by the
+     * network quality estimator.
+     */
+    @GuardedBy("mNetworkQualityLock")
+    private int mTransportRttMs = RttThroughputValues.INVALID_RTT_THROUGHPUT;
+
+    /**
+     * Current estimate of the downstream throughput (in kilobits per second)
+     * computed by the network quality estimator.
+     */
+    @GuardedBy("mNetworkQualityLock")
+    private int mDownstreamThroughputKbps = RttThroughputValues.INVALID_RTT_THROUGHPUT;
+
     @GuardedBy("mNetworkQualityLock")
     private final ObserverList<NetworkQualityRttListener> mRttListenerList =
             new ObserverList<NetworkQualityRttListener>();
@@ -327,13 +350,40 @@ public class CronetUrlRequestContext extends CronetEngine {
             throw new IllegalStateException("Network quality estimator must be enabled");
         }
         synchronized (mNetworkQualityLock) {
-            synchronized (mLock) {
-                checkHaveAdapter();
-            }
             return mEffectiveConnectionType;
         }
     }
 
+    @Override
+    public int getHttpRttMs() {
+        if (!mNetworkQualityEstimatorEnabled) {
+            throw new IllegalStateException("Network quality estimator must be enabled");
+        }
+        synchronized (mNetworkQualityLock) {
+            return mHttpRttMs;
+        }
+    }
+
+    @Override
+    public int getTransportRttMs() {
+        if (!mNetworkQualityEstimatorEnabled) {
+            throw new IllegalStateException("Network quality estimator must be enabled");
+        }
+        synchronized (mNetworkQualityLock) {
+            return mTransportRttMs;
+        }
+    }
+
+    @Override
+    public int getDownstreamThroughputKbps() {
+        if (!mNetworkQualityEstimatorEnabled) {
+            throw new IllegalStateException("Network quality estimator must be enabled");
+        }
+        synchronized (mNetworkQualityLock) {
+            return mDownstreamThroughputKbps;
+        }
+    }
+
     @VisibleForTesting
     @Override
     public void configureNetworkQualityEstimatorForTesting(
@@ -527,6 +577,17 @@ public class CronetUrlRequestContext extends CronetEngine {
 
     @SuppressWarnings("unused")
     @CalledByNative
+    private void onRTTOrThroughputEstimatesComputed(
+            final int httpRttMs, final int transportRttMs, final int downstreamThroughputKbps) {
+        synchronized (mNetworkQualityLock) {
+            mHttpRttMs = httpRttMs;
+            mTransportRttMs = transportRttMs;
+            mDownstreamThroughputKbps = downstreamThroughputKbps;
+        }
+    }
+
+    @SuppressWarnings("unused")
+    @CalledByNative
     private void onRttObservation(final int rttMs, final long whenMs, final int source) {
         synchronized (mNetworkQualityLock) {
             for (final NetworkQualityRttListener listener : mRttListenerList) {