Add support to Battery Status API in blink.

Source/modules/modules.gypi

Index: Source/modules/modules.gypi
diff --git a/Source/modules/modules.gypi b/Source/modules/modules.gypi
index b20542fa199403d93b6766f4c0325423543a05c5..dce8dea5cbbb4171a77db2aa23f9c73fe94c2873 100644
--- a/Source/modules/modules.gypi
+++ b/Source/modules/modules.gypi
@@ -10,6 +10,7 @@
     # Files for which bindings (.cpp and .h files) will be generated
     'modules_idl_files': [
       '<@(extra_blink_module_idl_files)',
+      'battery/BatteryManager.idl',
       'crypto/Algorithm.idl',
       'crypto/Crypto.idl',
       'crypto/Key.idl',
@@ -178,6 +179,7 @@
     ],
     # 'partial interface' or target (right side of) 'implements'
     'modules_dependency_idl_files': [
+      'battery/NavigatorBattery.idl',
       'crypto/WindowCrypto.idl',
       'crypto/WorkerGlobalScopeCrypto.idl',
       'donottrack/NavigatorDoNotTrack.idl',
@@ -215,6 +217,12 @@
     ],
     'modules_files': [
       '<@(extra_blink_module_files)',
+      'battery/BatteryManager.cpp',
+      'battery/BatteryManager.h',
+      'battery/BatteryStatus.cpp',
+      'battery/BatteryStatus.h',
+      'battery/NavigatorBattery.cpp',
+      'battery/NavigatorBattery.h',
       'crypto/Algorithm.cpp',
       'crypto/Algorithm.h',
       'crypto/Crypto.cpp',