am ce150742: am dc372cc7: Merge "Add a content observer for voicemail to the call log fragment"

import android.provider.CallLog;

import android.provider.CallLog.Calls;

import android.provider.ContactsContract;

import android.provider.VoicemailContract.Status;

import android.telephony.PhoneNumberUtils;

import android.telephony.TelephonyManager;

import android.view.LayoutInflater;

    // See issue 6363009

    private final ContentObserver mCallLogObserver = new CustomContentObserver();

    private final ContentObserver mContactsObserver = new CustomContentObserver();

    private final ContentObserver mVoicemailStatusObserver = new CustomContentObserver();

    private boolean mRefreshDataRequired = true;

    // Exactly same variable is in Fragment as a package private.

                mCallLogObserver);

        getActivity().getContentResolver().registerContentObserver(

                ContactsContract.Contacts.CONTENT_URI, true, mContactsObserver);

        getActivity().getContentResolver().registerContentObserver(

                Status.CONTENT_URI, true, mVoicemailStatusObserver);

        setHasOptionsMenu(true);

        updateCallList(mCallTypeFilter);

    }

        mAdapter.changeCursor(null);

        getActivity().getContentResolver().unregisterContentObserver(mCallLogObserver);

        getActivity().getContentResolver().unregisterContentObserver(mContactsObserver);

        getActivity().getContentResolver().unregisterContentObserver(mVoicemailStatusObserver);

    }

    @Override