[Overview Sharing] Pass the full screen progress to task overlay.

This is to change the alpha value of the suggest view when user swipe down.

Bug: 179514465
Test: local

Change-Id: Idfa66ff6d9bb43f35f859df828a19e3b47abcd65
diff --git a/quickstep/src/com/android/quickstep/TaskOverlayFactory.java b/quickstep/src/com/android/quickstep/TaskOverlayFactory.java
index 93ebd5a..844d6f5 100644
--- a/quickstep/src/com/android/quickstep/TaskOverlayFactory.java
+++ b/quickstep/src/com/android/quickstep/TaskOverlayFactory.java
@@ -222,6 +222,12 @@
         }
 
         /**
+         * Sets full screen progress to the task overlay.
+         */
+        public void setFullscreenProgress(float progress) {
+        }
+
+        /**
          * Gets the system shortcut for the screenshot that will be added to the task menu.
          */
         public SystemShortcut getScreenshotShortcut(BaseDraggingActivity activity,
diff --git a/quickstep/src/com/android/quickstep/views/TaskView.java b/quickstep/src/com/android/quickstep/views/TaskView.java
index 0654ab1..f420de6 100644
--- a/quickstep/src/com/android/quickstep/views/TaskView.java
+++ b/quickstep/src/com/android/quickstep/views/TaskView.java
@@ -1080,6 +1080,7 @@
         progress = Utilities.boundToRange(progress, 0, 1);
         mFullscreenProgress = progress;
         mIconView.setVisibility(progress < 1 ? VISIBLE : INVISIBLE);
+        getThumbnail().getTaskOverlay().setFullscreenProgress(progress);
 
         updateTaskScaling();