Reland "Replace Chrome IPC with Mojo IPC for querying BatteryStatus service"

device/battery/battery_status.mojom

Index: device/battery/battery_status.mojom
diff --git a/content/test/data/web_ui_test_mojo_bindings.mojom b/device/battery/battery_status.mojom
similarity index 51%
copy from content/test/data/web_ui_test_mojo_bindings.mojom
copy to device/battery/battery_status.mojom
index 45f291fdb4fc614cd291a5eb3be324c292fe4083..6e9ba4654933864c9f8f2d231fd2da6f0ecb1dbb 100644
--- a/content/test/data/web_ui_test_mojo_bindings.mojom
+++ b/device/battery/battery_status.mojom
@@ -2,15 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module content {
+module device {
 
-[Client=RendererTarget]
-interface BrowserTarget {
-  PingResponse();
-};
-
-interface RendererTarget {
-  Ping();
+struct BatteryStatus {
+  bool charging = true;
+  double charging_time = 0.0;
+  double discharging_time = double.INFINITY;
+  double level = 1.0;
 };
 
 }