[NetInfo] Add MaxBandwidthChanged notification and implement on Android

net/android/java/src/org/chromium/net/NetworkChangeNotifier.java

Index: net/android/java/src/org/chromium/net/NetworkChangeNotifier.java
diff --git a/net/android/java/src/org/chromium/net/NetworkChangeNotifier.java b/net/android/java/src/org/chromium/net/NetworkChangeNotifier.java
index 928af78e55e7a201e7fedc8b752fefee40a6b4a8..34c7c5a2fd53c8f07f5c30bbc5c1da1adb1845b5 100644
--- a/net/android/java/src/org/chromium/net/NetworkChangeNotifier.java
+++ b/net/android/java/src/org/chromium/net/NetworkChangeNotifier.java
@@ -147,14 +147,17 @@ public class NetworkChangeNotifier {
                     new NetworkChangeNotifierAutoDetect.Observer() {
                         @Override
                         public void onConnectionTypeChanged(int newConnectionType) {
-                            updateCurrentMaxBandwidth(mAutoDetector.getCurrentMaxBandwidthInMbps());
                             updateCurrentConnectionType(newConnectionType);
                         }
+                        @Override
+                        public void onMaxBandwidthChanged(double maxBandwidthMbps) {
+                            updateCurrentMaxBandwidth(maxBandwidthMbps);
+                        }
                     },
                     mContext,
                     alwaysWatchForChanges);
-                updateCurrentMaxBandwidth(mAutoDetector.getCurrentMaxBandwidthInMbps());
                 updateCurrentConnectionType(mAutoDetector.getCurrentConnectionType());
+                updateCurrentMaxBandwidth(mAutoDetector.getCurrentMaxBandwidthInMbps());
             }
         } else {
             destroyAutoDetector();
@@ -177,9 +180,9 @@ public class NetworkChangeNotifier {
         boolean connectionCurrentlyExists =
                 mCurrentConnectionType != ConnectionType.CONNECTION_NONE;
         if (connectionCurrentlyExists != forceOnline) {
-            updateCurrentMaxBandwidth(forceOnline ? Double.POSITIVE_INFINITY : 0.0);
             updateCurrentConnectionType(forceOnline ? ConnectionType.CONNECTION_UNKNOWN
                     : ConnectionType.CONNECTION_NONE);
+            updateCurrentMaxBandwidth(forceOnline ? Double.POSITIVE_INFINITY : 0.0);
         }
     }
 
@@ -188,8 +191,10 @@ public class NetworkChangeNotifier {
         notifyObserversOfConnectionTypeChange(newConnectionType);
     }
 
-    private void updateCurrentMaxBandwidth(double maxBandwidth) {
-        mCurrentMaxBandwidth = maxBandwidth;
+    private void updateCurrentMaxBandwidth(double maxBandwidthMbps) {
+        if (maxBandwidthMbps == mCurrentMaxBandwidth) return;
+        mCurrentMaxBandwidth = maxBandwidthMbps;
+        notifyObserversOfMaxBandwidthChange(maxBandwidthMbps);
     }
 
     /**
@@ -205,6 +210,16 @@ public class NetworkChangeNotifier {
     }
 
     /**
+     * Alerts all observers of a bandwidth change.
+     */
+    void notifyObserversOfMaxBandwidthChange(double maxBandwidthMbps) {
+        for (Long nativeChangeNotifier : mNativeChangeNotifiers) {
+            nativeNotifyMaxBandwidthChanged(nativeChangeNotifier, maxBandwidthMbps);
+        }
+    }
+
+
+    /**
      * Adds an observer for any connection type changes.
      */
     public static void addConnectionTypeObserver(ConnectionTypeObserver observer) {
@@ -229,6 +244,9 @@ public class NetworkChangeNotifier {
     @NativeClassQualifiedName("NetworkChangeNotifierDelegateAndroid")
     private native void nativeNotifyConnectionTypeChanged(long nativePtr, int newConnectionType);
 
+    @NativeClassQualifiedName("NetworkChangeNotifierDelegateAndroid")
+    private native void nativeNotifyMaxBandwidthChanged(long nativePtr, double maxBandwidthMbps);
+
     private static native double nativeGetMaxBandwidthForConnectionSubtype(int subtype);
 
     // For testing only.