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 RSSI (in dbM) of the currently registered cellular
+// connection is available, and sets |*rssi| to that value.
+NET_EXPORT bool GetRssiDbm(int32_t* rssi) WARN_UNUSED_RESULT;

[bengr, 2016/06/10 20:57:37]

Does this return false when in airplane mode or when there's no SIM?

[tbansal1, 2016/06/16 00:58:03]

It returns false in both cases.

+
+// Returns true if the signal level (between 0 and 4, both inclusive) of the
+// currently registered cellular connection is available, and sets
+// |*signal_level| to that value with lower value indicating lower signal
+// strength.
+NET_EXPORT bool GetSignalLevel(int32_t* signal_level) WARN_UNUSED_RESULT;
+
+bool Register(JNIEnv* env);
+
+}  // namespace cellular_signal_strength
+
+}  // namespace android
+
+}  // namespace net
+
+#endif  // NET_ANDROID_CELLULAR_SIGNAL_STRENGTH_H_