Enable component information on device state update patches

Add the component path for the state patch being sent to the device

BUG: 26106924
Change-Id: Iffbb81fcc9278e6191563220c5dc29897ff59643
Reviewed-on: https://weave-review.googlesource.com/1970
Reviewed-by: Johan Euphrosine <proppy@google.com>

src/device_registration_info.cc

diff --git a/src/device_registration_info.cc b/src/device_registration_info.cc
index bee536b..4e5b345 100644
--- a/src/device_registration_info.cc
+++ b/src/device_registration_info.cc
@@ -1164,9 +1164,7 @@
     std::unique_ptr<base::DictionaryValue> patch{new base::DictionaryValue};
     patch->SetString("timeMs",
                      std::to_string(state_change.timestamp.ToJavaTime()));
-    // TODO(avakulenko): Uncomment this once server supports "component"
-    // attribute on a state patch object.
-    // patch->SetString("component", state_change.component);
+    patch->SetString("component", state_change.component);
     patch->Set("patch", state_change.changed_properties.release());
     patches->Append(patch.release());
   }