[DevTools] Address crash by checking if Tab loaded successfully

chrome/android/java/src/org/chromium/chrome/browser/Tab.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.browser;
 
 import android.app.Activity;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Color;
@@ skipping 916 matching lines @@
             }
 
             return favicon;
         }
 
         return mFavicon;
     }
 
     /**
      * Loads the tab if it's not loaded (e.g. because it was killed in background).
-     * @return true iff tab load was triggered
+     * @return true iff the Tab handled the request.
      */
     @CalledByNative
     public boolean loadIfNeeded() {
         return false;
     }
 
     /**
      * @return Whether or not the tab is in the closing process.
      */
     public boolean isClosing() {
@@ skipping 255 matching lines @@
     private native int nativeLoadUrl(long nativeTabAndroid, String url, String extraHeaders,
             byte[] postData, int transition, String referrerUrl, int referrerPolicy,
             boolean isRendererInitiated);
     private native int nativeGetSecurityLevel(long nativeTabAndroid);
     private native void nativeSetActiveNavigationEntryTitleForUrl(long nativeTabAndroid, String url,
             String title);
     private native boolean nativePrint(long nativeTabAndroid);
     private native Bitmap nativeGetFavicon(long nativeTabAndroid);
     private native boolean nativeIsFaviconValid(long nativeTabAndroid);
 }