Added Network Quality Estimator Real-time interface to Cronet

components/cronet/android/java/src/org/chromium/net/UrlRequestContext.java

Index: components/cronet/android/java/src/org/chromium/net/UrlRequestContext.java
diff --git a/components/cronet/android/java/src/org/chromium/net/UrlRequestContext.java b/components/cronet/android/java/src/org/chromium/net/UrlRequestContext.java
index 3ed4106847cd8b989a84a32d38267655d98f8c2b..9b7e356f1a3210c1ddf76f4dc1a005a16935da02 100644
--- a/components/cronet/android/java/src/org/chromium/net/UrlRequestContext.java
+++ b/components/cronet/android/java/src/org/chromium/net/UrlRequestContext.java
@@ -94,6 +94,72 @@ public abstract class UrlRequestContext {
     public abstract void stopNetLog();
 
     /**
+     * Enables the network quality estimator, which collects and reports
+     * measurements of round trip time (RTT) and downstream throughput at
+     * various layers of the network stack. After enabling the estimator,
+     * listeners of RTT and throughput can be added with
+     * {@link #addRttListener} and {@link #addThroughputListener} and
+     * removed with {@link #removeRttListener} and
+     * {@link #removeThroughputListener}. The estimator uses memory and CPU
+     * only when enabled.
+     * @param executor an executor that will be used to notified all
+     *            added RTT and throughput listeners.
+     */
+    public abstract void enableNetworkQualityEstimator(Executor executor);
+
+    /**
+     * Enables the network quality estimator for testing. This must be called
+     * before round trip time and throughput listeners are added. Set both
+     * boolean parameters to false for default behavior.
+     * @param useLocalHostRequests include requests to localhost in estimates.
+     * @param useSmallerResponses include small responses in throughput estimates.
+     * @param executor an {@link java.util.concurrent.Executor} on which all
+     *            listeners will be called.
+     */
+    abstract void enableNetworkQualityEstimator(
+            boolean useLocalHostRequests, boolean useSmallerResponses, Executor executor);
+
+    /**
+     * Registers an listener that gets called whenever the network quality
+     * estimator witnesses a sample round trip time. This must be called
+     * after {@link #enableNetworkQualityEstimator}. Round trip times may be
+     * recorded at various layers of the network stack, including TCP, QUIC,
+     * and at the URL request layer. The listener is called on the
+     * {@link java.util.concurrent.Executor} that is passed to
+     * {@link #enableNetworkQualityEstimator}.
+     * @param listener the listener of round trip times.
+     */
+    public abstract void addRttListener(NetworkQualityRttListener listener);
+
+    /**
+     * Removes an listener of round trip times if on the listener list. This
+     * should be called after a NetworkQualityRttListener is added in order to
+     * stop receiving observations.
+     * @param listener the listener of round trip times.
+     */
+    public abstract void removeRttListener(NetworkQualityRttListener listener);
+
+    /**
+     * Registers an listener that gets called whenever the network quality

[mef, 2015/10/01 19:02:28]

I'm not native speaker, but shouldn't "an listener" be "a listener" here and
elsewhere.

[bengr, 2015/10/01 23:14:35]

Damn search and replace. Done.

+     * estimator witnesses a sample throughput measurement. This must be called
+     * after {@link #enableNetworkQualityEstimator}. Throughput observations
+     * are computed by measuring bytes read over the active network interface
+     * at times when at least one URL response is being received. The listener
+     * is called on the {@link java.util.concurrent.Executor} that is passed to
+     * {@link #enableNetworkQualityEstimator}.
+     * @param listener the listener of throughput.
+     */
+    public abstract void addThroughputListener(NetworkQualityThroughputListener listener);
+
+    /**
+     * Removes an listener of throughput. This should be called after a
+     * NetworkQualityThroughputListener is added in order to stop receiving
+     * observations.
+     * @param listener the listener of throughput.
+     */
+    public abstract void removeThroughputListener(NetworkQualityThroughputListener listener);
+
+    /**
      * Creates a {@link UrlRequestContext} with the given
      * {@link UrlRequestContextConfig}.
      * @param context Android {@link Context}.