Get the adapter type information from Android OS.

webrtc/base/network_unittest.cc

Index: webrtc/base/network_unittest.cc
diff --git a/webrtc/base/network_unittest.cc b/webrtc/base/network_unittest.cc
index 43ccb34c2868a504bbe43833a148e3a39a50644c..0f7d6db8ff2a54090fe99fc655ad735839e2861d 100644
--- a/webrtc/base/network_unittest.cc
+++ b/webrtc/base/network_unittest.cc
@@ -32,6 +32,9 @@ class FakeNetworkMonitor : public NetworkMonitorBase {
   void Start() override { started_ = true; }
   void Stop() override { started_ = false; }
   bool started() { return started_; }
+  AdapterType GetAdapterType(const std::string& if_name) override {
+    return ADAPTER_TYPE_UNKNOWN;
+  }
 
  private:
   bool started_ = false;