Remove duplicates between battery and display settings

Change preference keys of duplicate settings between
display and battery to avoid duplication in search.

Bug: 33701673
Test: make RunSettingsRoboTests
Change-Id: Iaad52f16ce33c478c64bcec656cc8edbe0c97283
Merged-In: I56c82e9e7f163d345065ca478849de9b14c173fe

tests/robotests/src/com/android/settings/testutils/XmlTestUtils.java

@@ -0,0 +1,57 @@
+package com.android.settings.testutils;
+
+import android.content.res.Resources;
+import android.content.res.XmlResourceParser;
+
+import android.content.Context;
+import android.text.TextUtils;
+import android.util.AttributeSet;
+import android.util.Xml;
+import com.android.settings.search2.XmlParserUtils;
+import org.xmlpull.v1.XmlPullParser;
+import org.xmlpull.v1.XmlPullParserException;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Util class for parsing XML
+ */
+public class XmlTestUtils {
+
+    /**
+     * Parses a preference screen's xml, collects and returns all keys used by preferences
+     * on the screen.
+     *
+     * @param context of the preference screen.
+     * @param xmlId of the Preference Xml to be parsed.
+     * @return List of all keys in the preference Xml
+     */
+    public static List<String> getKeysFromPreferenceXml(Context context, int xmlId) {
+        final XmlResourceParser parser = context.getResources().getXml(xmlId);
+        final AttributeSet attrs = Xml.asAttributeSet(parser);
+        final List<String> keys = new ArrayList<>();
+        String key;
+        try {
+            while (parser.next() != XmlPullParser.END_DOCUMENT) {
+                try {
+                    key = XmlParserUtils.getDataKey(context, attrs);
+                    if (!TextUtils.isEmpty(key)) {
+                        keys.add(key);
+                    }
+                } catch (NullPointerException e) {
+                    continue;
+                } catch (Resources.NotFoundException e) {
+                    continue;
+                }
+            }
+        } catch (java.io.IOException e) {
+            return null;
+        } catch (XmlPullParserException e) {
+            return null;
+        }
+
+        return keys;
+    }
+
+}