Move more sources from modules.gypi to subdirectories.

third_party/WebKit/Source/modules/battery/BUILD.gn

Index: third_party/WebKit/Source/modules/battery/BUILD.gn
diff --git a/third_party/WebKit/Source/modules/battery/BUILD.gn b/third_party/WebKit/Source/modules/battery/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..739062f0c18f0e45cebbf1ca44b260b8aa659830
--- /dev/null
+++ b/third_party/WebKit/Source/modules/battery/BUILD.gn
@@ -0,0 +1,21 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//third_party/WebKit/Source/modules/modules.gni")
+
+blink_modules_sources("battery") {
+  sources = [
+    "BatteryDispatcher.cpp",
+    "BatteryDispatcher.h",
+    "BatteryManager.cpp",
+    "BatteryManager.h",
+    "NavigatorBattery.cpp",
+    "NavigatorBattery.h",
+    "battery_status.h",
+  ]
+
+  deps = [
+    "//device/battery:mojo_bindings_blink",
+  ]
+}