Add default implementation of experimental methods

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 ad06db8d6bad74c59b266520a38c6ff63cc9ee59..8f7bc23b18bfb7271598238abd1aa34f06973874 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
@@ -346,7 +346,7 @@ public class CronetUrlRequestContext extends CronetEngineBase {
             throw new IllegalStateException("Network quality estimator must be enabled");
         }
         synchronized (mNetworkQualityLock) {
-            return mEffectiveConnectionType;
+            return convertConnectionTypeToApiValue(mEffectiveConnectionType);
         }
     }
 
@@ -356,7 +356,9 @@ public class CronetUrlRequestContext extends CronetEngineBase {
             throw new IllegalStateException("Network quality estimator must be enabled");
         }
         synchronized (mNetworkQualityLock) {
-            return mHttpRttMs;
+            return mHttpRttMs != RttThroughputValues.INVALID_RTT_THROUGHPUT
+                    ? mHttpRttMs
+                    : RTT_THROUGHPUT_UNKNOWN;
         }
     }
 
@@ -366,7 +368,9 @@ public class CronetUrlRequestContext extends CronetEngineBase {
             throw new IllegalStateException("Network quality estimator must be enabled");
         }
         synchronized (mNetworkQualityLock) {
-            return mTransportRttMs;
+            return mTransportRttMs != RttThroughputValues.INVALID_RTT_THROUGHPUT
+                    ? mTransportRttMs
+                    : RTT_THROUGHPUT_UNKNOWN;
         }
     }
 
@@ -376,7 +380,9 @@ public class CronetUrlRequestContext extends CronetEngineBase {
             throw new IllegalStateException("Network quality estimator must be enabled");
         }
         synchronized (mNetworkQualityLock) {
-            return mDownstreamThroughputKbps;
+            return mDownstreamThroughputKbps != RttThroughputValues.INVALID_RTT_THROUGHPUT
+                    ? mDownstreamThroughputKbps
+                    : RTT_THROUGHPUT_UNKNOWN;
         }
     }
 
@@ -552,6 +558,24 @@ public class CronetUrlRequestContext extends CronetEngineBase {
         return loggingLevel;
     }
 
+    private static int convertConnectionTypeToApiValue(
+            @EffectiveConnectionType.EffectiveConnectionTypeEnum int type) {
+        switch (type) {
+            case EffectiveConnectionType.TYPE_OFFLINE:
+                return EFFECTIVE_CONNECTION_TYPE_OFFLINE;
+            case EffectiveConnectionType.TYPE_SLOW_2G:
+                return EFFECTIVE_CONNECTION_TYPE_SLOW_2G;
+            case EffectiveConnectionType.TYPE_2G:
+                return EFFECTIVE_CONNECTION_TYPE_2G;
+            case EffectiveConnectionType.TYPE_3G:
+                return EFFECTIVE_CONNECTION_TYPE_3G;
+            case EffectiveConnectionType.TYPE_4G:
+                return EFFECTIVE_CONNECTION_TYPE_4G;
+            default:
+                return EFFECTIVE_CONNECTION_TYPE_UNKNOWN;
+        }
+    }
+
     @SuppressWarnings("unused")
     @CalledByNative
     private void initNetworkThread() {