Rewrite the Android implementation of BatteryMonitor directly in Java.

android_webview/libwebviewchromium.gypi

Index: android_webview/libwebviewchromium.gypi
diff --git a/android_webview/libwebviewchromium.gypi b/android_webview/libwebviewchromium.gypi
index 8f5dbe98563f46d15049a14ed3781b49f1e495e4..49a2ef0e04ba7569837e5b66bc29279514132965 100644
--- a/android_webview/libwebviewchromium.gypi
+++ b/android_webview/libwebviewchromium.gypi
@@ -9,10 +9,10 @@
   ],
   'conditions': [
     [ 'android_webview_build==1', {
-      # When building inside the android tree we also need to depend on all
-      # the java sources generated from templates which will be needed by
-      # android_webview_java in android_webview/java_library_common.mk.
       'dependencies': [
+        # When building inside the android tree we also need to depend on all
+        # the java sources generated from templates which will be needed by
+        # android_webview_java in android_webview/java_library_common.mk.
         '../base/base.gyp:base_java_application_state',
         '../base/base.gyp:base_java_library_load_from_apk_status_codes',
         '../base/base.gyp:base_java_memory_pressure_level',
@@ -37,6 +37,8 @@
         '../ui/android/ui_android.gyp:window_open_disposition_java',
         '../ui/android/ui_android.gyp:text_input_type_java',
         '../ui/touch_selection/ui_touch_selection.gyp:selection_event_type_java',
+        # We also need to depend on the Java bindings generated from the .mojom files.
+        '../device/battery/battery.gyp:device_battery_mojo_bindings_for_webview',
       ],
       # Enable feedback-directed optimisation for the library when building in
       # android.