Blimp: Propagating page loading status to tab

chrome/android/java/src/org/chromium/chrome/browser/tab/TabBlimpContentsObserver.java

 // Copyright 2016 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.tab;
 
 import org.chromium.base.ObserverList.RewindableIterator;
 import org.chromium.blimp_public.contents.EmptyBlimpContentsObserver;
 import org.chromium.ui.base.PageTransition;
 
 /**
  * BlimpContentsObserver used by Tab.
  */
 public class TabBlimpContentsObserver extends EmptyBlimpContentsObserver {
     private Tab mTab;
+    private boolean mPageIsLoading;
 
     public TabBlimpContentsObserver(Tab tab) {
         mTab = tab;
+        mPageIsLoading = false;
     }
 
     /**
      * All UI updates related to navigation state should be notified from this method.
      */
     @Override
     public void onNavigationStateChanged() {
         mTab.updateTitle();
         RewindableIterator<TabObserver> observers = mTab.getTabObservers();
         while (observers.hasNext()) {
             observers.next().onUrlUpdated(mTab);
         }
     }
 
     /**
      * Tab can use this to drive what kind of content to show based on the URL.
+     * Also sets the loading status of the tab correctly.
      */
     @Override
     public void onLoadingStateChanged(boolean loading) {
-        // TODO(dtrainor): Investigate if we need to pipe through a more accurate PageTransition
-        // here.
-        mTab.handleDidCommitProvisonalLoadForFrame(mTab.getUrl(), PageTransition.TYPED);
+        if (loading) {
+            // Passing true for toDifferentDocument to update visuals related to location bar.
+            mTab.onLoadStarted(true);
+        } else {
+            mTab.onLoadStopped();
+        }
+    }
+
+    /**
+     * This method is used to update the status of progress bar.
+     */
+    @Override
+    public void onPageLoadingStateChanged(boolean loading) {
+        mPageIsLoading = loading;
+        if (loading) {
+            mTab.didStartPageLoad(mTab.getUrl(), false);
+
+            // Simulate provisional load start and completion events.
+            mTab.handleDidStartProvisionalLoadForFrame(true, mTab.getUrl());
+
+            // TODO(dtrainor): Investigate if we need to pipe through a more accurate PageTransition
+            // here.
+            mTab.handleDidCommitProvisonalLoadForFrame(mTab.getUrl(), PageTransition.TYPED);
+
+            // Currently, blimp doesn't have a way to calculate the progress. So we are sending a
+            // fake progress value.
+            mTab.notifyLoadProgress(30);
+        } else {
+            mTab.notifyLoadProgress(100);
+            mTab.didFinishPageLoad();
+        }
+    }
+
+    /**
+     * @return a value between 0 and 100 reflecting what percentage of the page load is complete.
+     */
+    public int getMostRecentProgress() {
+        return mPageIsLoading ? 30 : 100;
     }
 }