Folder polish

- Update folder hint text to ensure enough contrast.
- Clamp down on alpha when animating to local color extraction
- Update colors to new spec.

Bug: 179209484
Bug: 175329686
Test: manual
Change-Id: I9471504e10f02630ae13b2c478ced1ee05bd5220

src/com/android/launcher3/AbstractFloatingView.java

@@ -39,7 +39,6 @@ import com.android.launcher3.anim.PendingAnimation;
 import com.android.launcher3.util.TouchController;
 import com.android.launcher3.views.ActivityContext;
 import com.android.launcher3.views.BaseDragLayer;
-import com.android.launcher3.widget.LocalColorExtractor;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -112,21 +111,12 @@ public abstract class AbstractFloatingView extends LinearLayout implements Touch
 
     protected boolean mIsOpen;
 
-    // Index used to get background color when using local wallpaper color extraction.
-    protected int mColorExtractionIndex;
-
     public AbstractFloatingView(Context context, AttributeSet attrs) {
         super(context, attrs);
-        init(context);
     }
 
     public AbstractFloatingView(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
-        init(context);
-    }
-
-    private void init(Context context) {
-        mColorExtractionIndex = LocalColorExtractor.getColorIndex(context);
     }
 
     /**