Draw vertical data usage sweep labels.

Using template string, ask axis to build label for sweeps.  Also
clean up margins exposed to parent view, since we offset when label
is larger than sweep drawable.

Bug: 4598460
Change-Id: If71bc8ec8c952023325c80b9bc00b63c23609c7a

src/com/android/settings/widget/InvertedChartAxis.java

@@ -16,6 +16,9 @@
 
 package com.android.settings.widget;
 
+import android.content.res.Resources;
+import android.text.SpannableStringBuilder;
+
 /**
  * Utility to invert another {@link ChartAxis}.
  */
@@ -49,13 +52,8 @@ public class InvertedChartAxis implements ChartAxis {
     }
 
     /** {@inheritDoc} */
-    public CharSequence getLabel(long value) {
-        return mWrapped.getLabel(value);
-    }
-
-    /** {@inheritDoc} */
-    public CharSequence getShortLabel(long value) {
-        return mWrapped.getShortLabel(value);
+    public void buildLabel(Resources res, SpannableStringBuilder builder, long value) {
+        mWrapped.buildLabel(res, builder, value);
     }
 
     /** {@inheritDoc} */