Expose cellular signal strength on Android to native

net/android/cellular_signal_strength.h

+// Copyright 2016 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_CELLULAR_SIGNAL_STRENGTH_H_
+#define NET_ANDROID_CELLULAR_SIGNAL_STRENGTH_H_
+
+#include <jni.h>
+#include <stdint.h>
+
+#include "base/compiler_specific.h"
+#include "net/base/net_export.h"
+
+namespace net {
+
+namespace android {
+
+namespace cellular_signal_strength {
+
+// Returns true if the signal strength (in dbM) of the currently registered
+// cellular connection is available, and sets |*signal_strength_dbm| to that
+// value.
+NET_EXPORT bool GetSignalStrengthDbm(int32_t* signal_strength_dbm)
+    WARN_UNUSED_RESULT;
+
+// Returns true if the signal strength level (between 0 and 4, both inclusive)
+// of the currently registered cellular connection is available, and sets
+// |*signal_strength_level| to that value with lower value indicating lower
+// signal strength.
+NET_EXPORT bool GetSignalStrengthLevel(int32_t* signal_strength_level)
+    WARN_UNUSED_RESULT;
+
+bool Register(JNIEnv* env);
+
+}  // namespace cellular_signal_strength
+
+}  // namespace android
+
+}  // namespace net
+
+#endif  // NET_ANDROID_CELLULAR_SIGNAL_STRENGTH_H_