Adding using protobuf based communication for the power information transfer.

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 4b97cac15b60e5e8e7a46e68b7a632254c799995..0bffa84be501f05c50f5ec7f59f3ef6b059b372b 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -4326,6 +4326,7 @@
             '../dbus/dbus.gyp:dbus',
             '../third_party/libevent/libevent.gyp:libevent',
             '../third_party/mozc/chrome/chromeos/renderer/chromeos_renderer.gyp:mozc_candidates_proto',
+            'power_supply_properties_proto',
           ],
           'sources/': [
             ['exclude', 'browser/extensions/default_apps.cc'],
@@ -5135,7 +5136,7 @@
                 ['exclude', '^browser/ui/webui/cookies_tree_model_adapter.cc'],
                 ['exclude', '^browser/ui/webui/cookies_tree_model_adapter.h'],
                 ['exclude', '^browser/ui/webui/tab_modal_confirm_dialog_webui.cc'],
-                ['exclude', '^browser/ui/webui/tab_modal_confirm_dialog_webui.h'],                
+                ['exclude', '^browser/ui/webui/tab_modal_confirm_dialog_webui.h'],
               ]
             }],
             # Exclude these toolkit_views specific files again.
@@ -5444,5 +5445,19 @@
       },
       'includes': [ '../build/protoc.gypi' ]
     },
+    {
+      # Protobuf compiler / generator for the PowerSupplyProperties protocol
+      # buffer.
+      'target_name': 'power_supply_properties_proto',
+      'type': 'static_library',
+      'sources': [
+        '../third_party/cros_system_api/dbus/power_supply_properties.proto',
+      ],
+      'variables': {
+        'proto_in_dir': '../third_party/cros_system_api/dbus/',
+        'proto_out_dir': 'chrome/browser/chromeos/dbus',
+      },
+      'includes': ['../build/protoc.gypi'],
+    },
   ],
 }