Add flag for new download app UI color and contrast update.

There have been new developments in the design of download apps to have better colors with better contrast. We will guard this progress under this flag.

Bug: 267272201
Test: N/A
Change-Id: I905436f32daeb62bed26b483773283ce38f66923
diff --git a/src/com/android/launcher3/config/FeatureFlags.java b/src/com/android/launcher3/config/FeatureFlags.java
index c328554..5af5c0a 100644
--- a/src/com/android/launcher3/config/FeatureFlags.java
+++ b/src/com/android/launcher3/config/FeatureFlags.java
@@ -334,6 +334,10 @@
             "ENABLE_DOWNLOAD_APP_UX_V2", true, "Updates the download app UX"
                     + " to have better visuals");
 
+    public static final BooleanFlag ENABLE_DOWNLOAD_APP_UX_V3 = getDebugFlag(
+            "ENABLE_DOWNLOAD_APP_UX_V3", false, "Updates the download app UX"
+            + " to have better visuals, improve contrast, and color");
+
     public static final BooleanFlag ENABLE_TASKBAR_REVISED_THRESHOLDS = getDebugFlag(
             "ENABLE_TASKBAR_REVISED_THRESHOLDS", true,
             "Uses revised thresholds for transient taskbar.");