Move inverted mode to Accessibility settings
Add contrast settings

bug:5111259

Change-Id: Ic95e1fbae94c01fc8560cbd326503244b9ab4988
diff --git a/res/xml/accessibility_preferences.xml b/res/xml/accessibility_preferences.xml
index a7124f4..db5a539 100644
--- a/res/xml/accessibility_preferences.xml
+++ b/res/xml/accessibility_preferences.xml
@@ -40,4 +40,20 @@
 
     </PreferenceCategory>
 
+    <PreferenceCategory android:title="@string/pref_inverted_category">
+
+        <CheckBoxPreference
+            android:key="inverted"
+            android:defaultValue="false"
+            android:title="@string/pref_inverted"
+            android:summary="@string/pref_inverted_summary" />
+
+        <com.android.browser.preferences.FontSizePreference
+            android:key="inverted_contrast"
+            android:title="@string/pref_inverted_contrast"
+            android:defaultValue="0"
+            android:max="20" />
+
+    </PreferenceCategory>
+
 </PreferenceScreen>