[pm/incremental] add @FloatRange in the new LauncherActivityInfo API

Addressing the comment in b/171804873

BUG: 171804873
Test: builds
Change-Id: Ie7980973572443007f9205535ab9da575d3ea97b

api/current.txt

@@ -11744,7 +11744,7 @@ package android.content.pm {
     method public long getFirstInstallTime();
     method public android.graphics.drawable.Drawable getIcon(int);
     method public CharSequence getLabel();
-    method public float getLoadingProgress();
+    method @FloatRange(from=0.0, to=1.0) public float getLoadingProgress();
     method public String getName();
     method public android.os.UserHandle getUser();
   }