Add FeedbackReporter for reporting distillation quality.

chrome/android/java/src/org/chromium/chrome/browser/Tab.java

Index: chrome/android/java/src/org/chromium/chrome/browser/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/Tab.java
index 62b54f48aff5577a168e74245f7c3dad882de7db..eabf99444861e6e7c7b9d3e6806da8237d0f3bef 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/Tab.java
@@ -21,6 +21,7 @@ import org.chromium.chrome.browser.contextmenu.ContextMenuParams;
 import org.chromium.chrome.browser.contextmenu.ContextMenuPopulator;
 import org.chromium.chrome.browser.contextmenu.ContextMenuPopulatorWrapper;
 import org.chromium.chrome.browser.contextmenu.EmptyChromeContextMenuItemDelegate;
+import org.chromium.chrome.browser.dom_distiller.FeedbackReporter;
 import org.chromium.chrome.browser.infobar.AutoLoginProcessor;
 import org.chromium.chrome.browser.infobar.InfoBarContainer;
 import org.chromium.chrome.browser.profiles.Profile;
@@ -128,6 +129,7 @@ public class Tab implements NavigationClient {
     private WebContentsObserverAndroid mWebContentsObserver;
     private VoiceSearchTabHelper mVoiceSearchTabHelper;
     private TabChromeWebContentsDelegateAndroid mWebContentsDelegate;
+    private FeedbackReporter mFeedbackReporter;
 
     /**
      * A default {@link ChromeContextMenuItemDelegate} that supports some of the context menu
@@ -773,6 +775,10 @@ public class Tab implements NavigationClient {
             mAppBannerManager = new AppBannerManager(this);
         }
 
+        if (FeedbackReporter.isEnabled() && mFeedbackReporter == null) {
+            mFeedbackReporter = new FeedbackReporter(this);
+        }
+
         for (TabObserver observer : mObservers) observer.onContentChanged(this);
     }