Voice search icon not touch explorable.

1. The overlaid DrawableStateProxyView was reacting to
   hover events essentially being touch explored so the
   views it coders did not get a chance to be touch
   explored. Now this view ignores hover events.

bug:6581924

Change-Id: I69d5ccaaf88b0f0ef661a237ce8a8abb8f65fa95

src/com/android/launcher2/DrawableStateProxyView.java

@@ -19,6 +19,7 @@ package com.android.launcher2;
 import android.content.Context;
 import android.content.res.TypedArray;
 import android.util.AttributeSet;
+import android.view.MotionEvent;
 import android.view.View;
 import android.widget.LinearLayout;
 
@@ -37,6 +38,7 @@ public class DrawableStateProxyView extends LinearLayout {
         this(context, attrs, 0);
     }
 
+
     public DrawableStateProxyView(Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs, defStyle);
 
@@ -59,4 +61,9 @@ public class DrawableStateProxyView extends LinearLayout {
         mView.setPressed(isPressed());
         mView.setHovered(isHovered());
     }
+
+    @Override
+    public boolean onHoverEvent(MotionEvent event) {
+        return false;
+    }
 }