Expose cellular signal strength on Android to native

net/net.gyp

Index: net/net.gyp
diff --git a/net/net.gyp b/net/net.gyp
index dfeee21b7b3152fa1872ef72eb823da3aeaa01df..328c0a6b631c2a249a946c0bd0e5cdd12497a2b4 100644
--- a/net/net.gyp
+++ b/net/net.gyp
@@ -1409,6 +1409,7 @@
           'target_name': 'net_jni_headers',
           'type': 'none',
           'sources': [
+            'android/java/src/org/chromium/net/AndroidCellularSignalStrength.java',
             'android/java/src/org/chromium/net/AndroidCertVerifyResult.java',
             'android/java/src/org/chromium/net/AndroidKeyStore.java',
             'android/java/src/org/chromium/net/AndroidNetworkLibrary.java',
@@ -1446,6 +1447,7 @@
           },
           'dependencies': [
             '../base/base.gyp:base',
+            'cellular_signal_strength_error_java',
             'cert_verify_status_android_java',
             'certificate_mime_types_java',
             'network_change_notifier_types_java',
@@ -1576,6 +1578,14 @@
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
         {
+          'target_name': 'cellular_signal_strength_error_java',
+          'type': 'none',
+          'variables': {
+            'source_file': 'android/cellular_signal_strength.cc',
+          },
+          'includes': [ '../build/android/java_cpp_enum.gypi' ],
+        },
+        {
           'target_name': 'certificate_mime_types_java',
           'type': 'none',
           'variables': {