Make LinearColorBar support RTL

- Move the class to widget package
- Remove a bunch of useless drawing

Change-Id: I82f840819c89eaf3cf9b7a87e56f1031989e3262
Fixes: 62700884
Test:  robotest

src/com/android/settings/applications/RunningProcessesView.java

@@ -43,6 +43,7 @@ import com.android.internal.util.MemInfoReader;
 import com.android.settings.R;
 import com.android.settings.SettingsActivity;
 import com.android.settings.Utils;
+import com.android.settings.widget.LinearColorBar;
 
 import java.util.ArrayList;
 import java.util.Collections;