[NetInfo] Add MaxBandwidthChanged notification and implement on Android

net/android/network_change_notifier_delegate_android.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_ANDROID_NETWORK_CHANGE_NOTIFIER_DELEGATE_ANDROID_H_
 #define NET_ANDROID_NETWORK_CHANGE_NOTIFIER_DELEGATE_ANDROID_H_
 
 #include "base/android/jni_android.h"
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
@@ skipping 15 matching lines @@
 
   // Observer interface implemented by NetworkChangeNotifierAndroid which
   // subscribes to network change notifications fired by the delegate (and
   // initiated by the Java side).
   class Observer {
    public:
     virtual ~Observer() {}
 
     // Updates the current connection type.
     virtual void OnConnectionTypeChanged() = 0;
+
+    // Updates the current max bandwidth.
+    virtual void OnMaxBandwidthChanged(double max_bandwidth_mbps) = 0;
   };
 
   NetworkChangeNotifierDelegateAndroid();
   ~NetworkChangeNotifierDelegateAndroid();
 
   // Called from NetworkChangeNotifierAndroid.java on the JNI thread whenever
   // the connection type changes. This updates the current connection type seen
   // by this class and forwards the notification to the observers that
   // subscribed through AddObserver().
   void NotifyConnectionTypeChanged(JNIEnv* env,
                                    jobject obj,
                                    jint new_connection_type);
   jint GetConnectionType(JNIEnv* env, jobject obj) const;
 
+  // Called from NetworkChangeNotifierAndroid.java on the JNI thread whenever
+  // the maximum bandwidth of the connection changes. This updates the current
+  // max bandwidth seen by this class and forwards the notification to the
+  // observers that subscribed through AddObserver().
+  void NotifyMaxBandwidthChanged(JNIEnv* env,
+                                 jobject obj,
+                                 jdouble new_max_bandwidth);
+
   // These methods can be called on any thread. Note that the provided observer
   // will be notified on the thread AddObserver() is called on.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // Can be called from any thread.
   ConnectionType GetCurrentConnectionType() const;
 
   // Can be called from any thread.
   double GetCurrentMaxBandwidth() const;
@@ skipping 18 matching lines @@
   mutable base::Lock connection_lock_;  // Protects the state below.
   ConnectionType connection_type_;
   double connection_max_bandwidth_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifierDelegateAndroid);
 };
 
 }  // namespace net
 
 #endif  // NET_ANDROID_NETWORK_CHANGE_NOTIFIER_DELEGATE_H_