Fix bug where font size (etc.) doesn't change after changing display settings.

The metrics we get from Display#getMetrics does not change regardless of
what the new configuration is (we would expect the scaledDensity to change).

Documentation shows that Display#getMetrics is deprecated in R.

Using guidance from b/154665987#comment14 we get the metrics from the derived
context.

Bug: 156141463
Change-Id: I25e5f2c13f94e0471111f6c895694947998e3222

src/com/android/launcher3/InvariantDeviceProfile.java

@@ -200,7 +200,7 @@ public class InvariantDeviceProfile {
                 DefaultDisplay.INSTANCE.get(context).getInfo(),
                 getPredefinedDeviceProfiles(context, gridName));
 
-        Info myInfo = new Info(display);
+        Info myInfo = new Info(context, display);
         DisplayOption myDisplayOption = invDistWeightedInterpolate(
                 myInfo, getPredefinedDeviceProfiles(context, gridName));
 

src/com/android/launcher3/util/DefaultDisplay.java

@@ -145,10 +145,11 @@ public class DefaultDisplay implements DisplayListener {
         }
 
         private Info(Context context) {
-            this(context.getSystemService(DisplayManager.class).getDisplay(DEFAULT_DISPLAY));
+            this(context, context.getSystemService(DisplayManager.class)
+                    .getDisplay(DEFAULT_DISPLAY));
         }
 
-        public Info(Display display) {
+        public Info(Context context, Display display) {
             id = display.getDisplayId();
             rotation = display.getRotation();
 
@@ -161,8 +162,8 @@ public class DefaultDisplay implements DisplayListener {
             display.getRealSize(realSize);
             display.getCurrentSizeRange(smallestSize, largestSize);
 
-            metrics = new DisplayMetrics();
-            display.getMetrics(metrics);
+            Context defaultDisplayContext = context.createDisplayContext(display);
+            metrics = defaultDisplayContext.getResources().getDisplayMetrics();
         }
 
         private boolean hasDifferentSize(Info info) {