Rewrite the Android implementation of BatteryMonitor directly in Java.

content/browser/mojo/mojo_application_host.h

Index: content/browser/mojo/mojo_application_host.h
diff --git a/content/browser/mojo/mojo_application_host.h b/content/browser/mojo/mojo_application_host.h
index 61671068e5a5a1efe77362214406492574cf209d..0c02c49925308be89170e3ef5c9539e9c5237c8e 100644
--- a/content/browser/mojo/mojo_application_host.h
+++ b/content/browser/mojo/mojo_application_host.h
@@ -41,6 +41,12 @@ class CONTENT_EXPORT MojoApplicationHost {
 
   ServiceRegistry* service_registry() { return &service_registry_; }
 
+#if defined(OS_ANDROID)
+  ServiceRegistryAndroid* service_registry_android() {
+    return service_registry_android_.get();
+  }
+#endif
+
  private:
   mojo::embedder::ChannelInit channel_init_;
   mojo::embedder::ScopedPlatformHandle client_handle_;