[Suggestions UI] Drop Bitmap references from articles under memory pressure.

chrome/android/java/src/org/chromium/chrome/browser/suggestions/SuggestionsBottomSheetContent.java

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.suggestions;
 
 import android.annotation.SuppressLint;
 import android.support.v7.widget.RecyclerView;
 import android.support.v7.widget.RecyclerView.OnScrollListener;
 import android.view.LayoutInflater;
 import android.view.MotionEvent;
 import android.view.View;
 
 import org.chromium.base.ApiCompatibilityUtils;
+import org.chromium.base.DiscardableReferencePool;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.NativePageHost;
 import org.chromium.chrome.browser.ntp.ContextMenuManager;
 import org.chromium.chrome.browser.ntp.ContextMenuManager.TouchEnabledDelegate;
 import org.chromium.chrome.browser.ntp.cards.NewTabPageAdapter;
 import org.chromium.chrome.browser.ntp.snippets.SnippetsBridge;
 import org.chromium.chrome.browser.ntp.snippets.SuggestionsSource;
 import org.chromium.chrome.browser.offlinepages.OfflinePageBridge;
 import org.chromium.chrome.browser.omnibox.LocationBar;
@@ skipping 24 matching lines @@
     private final BottomSheet mBottomSheet;
     private final BottomSheetObserver mBottomSheetObserver;
 
     public SuggestionsBottomSheetContent(final ChromeActivity activity, final BottomSheet sheet,
             TabModelSelector tabModelSelector, SnackbarManager snackbarManager) {
         Profile profile = Profile.getLastUsedProfile();
         SuggestionsNavigationDelegate navigationDelegate =
                 new SuggestionsNavigationDelegateImpl(activity, profile, sheet, tabModelSelector);
         mTileGroupDelegate = new TileGroupDelegateImpl(
                 activity, profile, tabModelSelector, navigationDelegate, snackbarManager);
-        mSuggestionsUiDelegate = createSuggestionsDelegate(profile, navigationDelegate, sheet);
+        mSuggestionsUiDelegate = createSuggestionsDelegate(
+                profile, navigationDelegate, sheet, activity.getReferencePool());
 
         mView = LayoutInflater.from(activity).inflate(
                 R.layout.suggestions_bottom_sheet_content, null);
         mRecyclerView = (SuggestionsRecyclerView) mView.findViewById(R.id.recycler_view);
 
         TouchEnabledDelegate touchEnabledDelegate = new TouchEnabledDelegate() {
             @Override
             public void setTouchEnabled(boolean enabled) {
                 activity.getBottomSheet().setTouchEnabled(enabled);
             }
@@ skipping 102 matching lines @@
 
     public static void setSuggestionsSourceForTesting(SuggestionsSource suggestionsSource) {
         sSuggestionsSourceForTesting = suggestionsSource;
     }
 
     public static void setEventReporterForTesting(SuggestionsEventReporter eventReporter) {
         sEventReporterForTesting = eventReporter;
     }
 
     private static SuggestionsUiDelegateImpl createSuggestionsDelegate(Profile profile,
-            SuggestionsNavigationDelegate navigationDelegate, NativePageHost host) {
+            SuggestionsNavigationDelegate navigationDelegate, NativePageHost host,
+            DiscardableReferencePool referencePool) {
         SnippetsBridge snippetsBridge = null;
         SuggestionsSource suggestionsSource;
         SuggestionsEventReporter eventReporter;
 
         if (sSuggestionsSourceForTesting == null) {
             snippetsBridge = new SnippetsBridge(profile);
             suggestionsSource = snippetsBridge;
         } else {
             suggestionsSource = sSuggestionsSourceForTesting;
         }
 
         if (sEventReporterForTesting == null) {
             eventReporter = new SuggestionsEventReporterBridge();
         } else {
             eventReporter = sEventReporterForTesting;
         }
 
         SuggestionsUiDelegateImpl delegate = new SuggestionsUiDelegateImpl(
-                suggestionsSource, eventReporter, navigationDelegate, profile, host);
+                suggestionsSource, eventReporter, navigationDelegate, profile, host, referencePool);
         if (snippetsBridge != null) delegate.addDestructionObserver(snippetsBridge);
 
         return delegate;
     }
 }