[Android] Add phone progress bar animation behind a flag.

chrome/android/shell/java/src/org/chromium/chrome/shell/ChromeShellToolbar.java

 // Copyright 2014 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.shell;
 
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.res.Configuration;
 import android.util.AttributeSet;
@@ skipping 18 matching lines @@
 import org.chromium.chrome.browser.widget.ToolbarProgressBar;
 import org.chromium.chrome.shell.omnibox.SuggestionPopup;
 import org.chromium.content.common.ContentSwitches;
 
 /**
  * A Toolbar {@link View} that shows the URL and navigation buttons.
  */
 public class ChromeShellToolbar extends LinearLayout {
 
     private final Runnable mUpdateProgressRunnable = new Runnable() {
+        private boolean mIsStarted = false;
+
         @Override
         public void run() {
             mStopReloadButton.setImageResource(
                     mLoading ? R.drawable.btn_close : R.drawable.btn_toolbar_reload);
 
-            // Note: We have an assertion in setProgress that checks if it's started.
-            //       Calling mProgressBar.start(); here is not ideal as it could be redundant.
-            //       But currently we didn't hook loading start/end events in Chrome shell and
-            //       anyways we will be deleting Chrome shell soon, so will leave as it is.
-            mProgressBar.start();
             if (mProgress == 100.0f) {
-                if (mProgressBar.getProgress() != 1.0f) mProgressBar.setProgress(1.0f);
-                mProgressBar.finish(true);
+                if (mIsStarted) {
+                    if (mProgressBar.getProgress() != 1.0f) mProgressBar.setProgress(1.0f);
+                    mProgressBar.finish(true);
+                    mIsStarted = false;
+                }
             } else {
+                if (!mIsStarted) {
+                    mProgressBar.start();
+                    mIsStarted = true;
+                }
                 mProgressBar.setProgress(mProgress / 100.0f);
             }
         }
     };
 
     private EditText mUrlTextView;
     private ToolbarProgressBar mProgressBar;
 
     private ChromeShellTab mTab;
     private final TabObserver mTabObserver;
@@ skipping 67 matching lines @@
      */
     public void hideSuggestions() {
         if (mSuggestionPopup != null) mSuggestionPopup.hideSuggestions();
     }
 
     @Override
     protected void onFinishInflate() {
         super.onFinishInflate();
 
         mProgressBar = (ToolbarProgressBar) findViewById(R.id.progress);
+        mProgressBar.initializeAnimation();
         initializeUrlField();
         initializeTabSwitcherButton();
         initializeMenuButton();
         initializeStopReloadButton();
         initializeAddButton();
     }
 
     void setMenuHandler(AppMenuHandler menuHandler) {
         mMenuHandler = menuHandler;
         mAppMenuButtonHelper = new AppMenuButtonHelper(mMenuHandler);
@@ skipping 144 matching lines @@
         public void onLoadProgressChanged(Tab tab, int progress) {
             if (tab == mTab) ChromeShellToolbar.this.onLoadProgressChanged(progress);
         }
 
         @Override
         public void onUpdateUrl(Tab tab, String url) {
             if (tab == mTab) ChromeShellToolbar.this.onUpdateUrl(url);
         }
     }
 }