Iteration on multi-user Storage UI.

Now that DefaultContainerService has visibility of external storage
for all users, we can measure internal storage in a single pass.
Internal storage measurement now iterates across all known users,
counting both apps and emulated storage usage.

Create MeasurementDetails object with documentation about what is
counted under various device configurations.  Generalize to measure
each Environment.DIRECTORY separately, so it can be combined as
needed.  General cleanup of how measurements are passed to UI.

Bug: 7003520
Change-Id: Ib89c185296a0c9debdc20beeaa98584d803a84e8

src/com/android/settings/deviceinfo/MiscFilesHandler.java

@@ -20,7 +20,6 @@ import android.app.Activity;
 import android.app.ListActivity;
 import android.content.Context;
 import android.os.Bundle;
-import android.os.UserHandle;
 import android.os.storage.StorageVolume;
 import android.text.format.Formatter;
 import android.util.Log;
@@ -195,7 +194,7 @@ public class MiscFilesHandler extends ListActivity {
             final StorageVolume storageVolume = activity.getIntent().getParcelableExtra(
                     StorageVolume.EXTRA_STORAGE_VOLUME);
             StorageMeasurement mMeasurement = StorageMeasurement.getInstance(
-                    activity, storageVolume, UserHandle.CURRENT);
+                    activity, storageVolume);
             if (mMeasurement == null) return;
             mData = (ArrayList<StorageMeasurement.FileInfo>) mMeasurement.mFileInfoForMisc;
             if (mData != null) {