Battery listener for download service in native code.

components/download/internal/BUILD.gn

Index: components/download/internal/BUILD.gn
diff --git a/components/download/internal/BUILD.gn b/components/download/internal/BUILD.gn
index 1e3d1a2e6b6145e2cd0af05d62091614218f1c6d..189bf077e320f3bab2eff07a61b5339d0bf16adc 100644
--- a/components/download/internal/BUILD.gn
+++ b/components/download/internal/BUILD.gn
@@ -18,6 +18,8 @@ static_library("internal") {
     "config.h",
     "download_service_impl.cc",
     "download_service_impl.h",
+    "scheduler/battery_listener.cc",
+    "scheduler/battery_listener.h",
   ]
 
   deps = [
@@ -33,11 +35,13 @@ source_set("unit_tests") {
 
   sources = [
     "download_service_impl_unittest.cc",
+    "scheduler/battery_listener_unittest.cc",
   ]
 
   deps = [
     ":internal",
     "//base/test:test_support",
+    "//testing/gmock",
     "//testing/gtest",
   ]
 }