This cl fixes conditions of when to skip the blur. While setting any new surface, we should always apply the blur.
Fix: 417131537
Fix: 416689392
Test: Go to overview from app. Go to home from app
Flag: com.android.launcher3.enable_overview_background_wallpaper_blur
Change-Id: I16ff00cf0be554eaf9aa4f48adc23b5cec4ae3da