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

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

Index: chrome/android/java/src/org/chromium/chrome/browser/suggestions/SuggestionsUiDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/suggestions/SuggestionsUiDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/suggestions/SuggestionsUiDelegate.java
index b0579b6e353ebe48a67c3b7b0ca445db25b36fb8..fce6d5049c5d1efed30a79a657b48740beb7fc13 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/suggestions/SuggestionsUiDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/suggestions/SuggestionsUiDelegate.java
@@ -4,6 +4,7 @@
 
 package org.chromium.chrome.browser.suggestions;
 
+import org.chromium.base.DiscardableReferencePool;
 import org.chromium.chrome.browser.favicon.FaviconHelper.FaviconImageCallback;
 import org.chromium.chrome.browser.favicon.FaviconHelper.IconAvailabilityCallback;
 import org.chromium.chrome.browser.favicon.LargeIconBridge.LargeIconCallback;
@@ -29,6 +30,12 @@ public interface SuggestionsUiDelegate {
     /** Convenience method to access the {@link SuggestionsNavigationDelegate}. */
     SuggestionsNavigationDelegate getNavigationDelegate();
 
+    /**
+     * @return The reference pool to use for large objects that should be dropped under
+     * memory pressure.
+     */
+    DiscardableReferencePool getReferencePool();
+
     // Favicons
 
     /**
@@ -65,6 +72,6 @@ public interface SuggestionsUiDelegate {
      */
     void addDestructionObserver(DestructionObserver destructionObserver);
 
-    /** @return whether the suggestions UI is currently visible. */
+    /** @return Whether the suggestions UI is currently visible. */
     boolean isVisible();
 }