Consolidate Search result UIs

- Allow SearchAction to be represented by SearchResultIcon and SearchResultIconRow
- Fix tap enter to launch regression
- Remove Plugin Pipeline

Bug: 177223401
Test: Manual
Change-Id: Id1d445f6af3f80f840d567165051188c78230ed0

src/com/android/launcher3/allapps/search/SearchAdapterProvider.java

@@ -18,6 +18,7 @@ package com.android.launcher3.allapps.search;
 
 
 import android.view.LayoutInflater;
+import android.view.View;
 import android.view.ViewGroup;
 
 import com.android.launcher3.BaseDraggingActivity;
@@ -61,5 +62,6 @@ public abstract class SearchAdapterProvider {
      * handles selection event on search adapter item. Returns false if provider can not handle
      * event
      */
-    public abstract boolean onAdapterItemSelected(AllAppsGridAdapter.AdapterItem focusedItem);
+    public abstract boolean onAdapterItemSelected(AllAppsGridAdapter.AdapterItem adapterItem,
+            View view);
 }