Fix the battery status API.

Battery status was crashing when called because the Java code in the
component was not being compiled into the webview in the android build
system. Add the missing java source directory. Battery status now works.
http://crbug.com/465366

Change-Id: I6e0f7d8d4bd0f8a284ac3e6a2a7c9e7ec1585f51
1 file changed