Hook up new distillability with Clank UI

chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModeTabInfo.java

 // Copyright 2015 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.dom_distiller;
 
 import org.chromium.content_public.browser.WebContentsObserver;
 
 /**
  * This class tracks the per-tab state of reader mode.
  */
 public class ReaderModeTabInfo {
     // The WebContentsObserver responsible for updates to the distillation status of the tab.
     private WebContentsObserver mWebContentsObserver;
 
     // The distillation status of the tab.
     private int mStatus;
 
     // If the panel was closed due to the close button.
     private boolean mIsDismissed;
 
     // The URL that distiller is using for this tab. This is used to check if a result comes
     // back from distiller and the user has already loaded a new URL.
     private String mCurrentUrl;
 
+    // The distillability heuristics now use a callback to notify the manager that a page can
+    // be distilled. This flag is used to detect if the callback is set for this tab.
+    private boolean mIsCallbackSet;
+
     /**
      * @param observer The WebContentsObserver for the tab this object represents.
      */
     public void setWebContentsObserver(WebContentsObserver observer) {
         mWebContentsObserver = observer;
     }
 
     /**
      * @return The WebContentsObserver for the tab this object represents.
      */
@@ skipping 35 matching lines @@
     public void setUrl(String url) {
         mCurrentUrl = url;
     }
 
     /**
      * @return The last URL being processed by reader mode.
      */
     public String getUrl() {
         return mCurrentUrl;
     }
+
+    /**
+     * @return If the distillability callback is set for this object's tab.
+     */
+    public boolean isCallbackSet() {
+        return mIsCallbackSet;
+    }
+
+    /**
+     * @param isSet Set if this object's tab has a distillability callback.
+     */
+    public void setIsCallbackSet(boolean isSet) {
+        mIsCallbackSet = isSet;
+    }
 }