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

chrome/android/javatests/src/org/chromium/chrome/browser/ntp/snippets/ArticleSnippetsTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/ntp/snippets/ArticleSnippetsTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/ntp/snippets/ArticleSnippetsTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/ntp/snippets/ArticleSnippetsTest.java
index 37a6b1f332d556b8297abeb2eab43541c4110737..0b953e27c4b97b8815a609e1b9e9337a28696123 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/ntp/snippets/ArticleSnippetsTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/ntp/snippets/ArticleSnippetsTest.java
@@ -10,6 +10,7 @@ import android.util.TypedValue;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
 
+import org.chromium.base.ReferencePool;
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.test.util.Feature;
 import org.chromium.base.test.util.RetryOnFailure;
@@ -197,6 +198,7 @@ public class ArticleSnippetsTest extends ChromeActivityTestCaseBase<ChromeActivi
         private SuggestionsEventReporter mSuggestionsEventReporter =
                 new DummySuggestionsEventReporter();
         private SuggestionsRanker mSuggestionsRanker = new SuggestionsRanker();
+        private final ReferencePool mReferencePool = new ReferencePool();
 
         @Override
         public void getLocalFaviconImageForURL(
@@ -236,6 +238,11 @@ public class ArticleSnippetsTest extends ChromeActivityTestCaseBase<ChromeActivi
         }
 
         @Override
+        public ReferencePool getReferencePool() {
+            return mReferencePool;
+        }
+
+        @Override
         public void addDestructionObserver(DestructionObserver destructionObserver) {}
 
         @Override