Show translate error message when translation failed.

chrome/android/java/src/org/chromium/chrome/browser/infobar/TranslateCompactInfoBar.java

 // Copyright 2017 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.infobar;
 
 import android.support.design.widget.TabLayout;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.LinearLayout;
 
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.infobar.translate.TranslateMenu;
 import org.chromium.chrome.browser.infobar.translate.TranslateMenuHelper;
 import org.chromium.chrome.browser.infobar.translate.TranslateTabLayout;
+import org.chromium.ui.widget.Toast;
 
 /**
  * Java version of the compcat translate infobar
  */
 class TranslateCompactInfoBar extends InfoBar
         implements TabLayout.OnTabSelectedListener, TranslateMenuHelper.TranslateMenuListener {
     private static final int SOURCE_TAB_INDEX = 0;
     private static final int TARGET_TAB_INDEX = 1;
 
     private final TranslateOptions mOptions;
@@ skipping 57 matching lines @@
             mTabLayout.showProgressBarOnTab(TARGET_TAB_INDEX);
             onButtonClicked(ActionType.TRANSLATE);
         } else {
             mTabLayout.getTabAt(TARGET_TAB_INDEX).select();
         }
     }
 
     @CalledByNative
     private void onPageTranslated(int errorType) {
         if (mTabLayout != null) {
-            // Success
-            if (errorType == 0) {
-                mTabLayout.hideProgressBar();
-            } else {
-                mTabLayout.stopProgressBarAndRevertBack();
+            mTabLayout.hideProgressBar();
+            if (errorType != 0) {
+                Toast.makeText(getContext(), R.string.translate_infobar_error, Toast.LENGTH_SHORT)
+                        .show();
+                // Disable OnTabSelectedListener then revert selection.
+                mTabLayout.removeOnTabSelectedListener(this);
+                mTabLayout.getTabAt(SOURCE_TAB_INDEX).select();
+                // Add OnTabSelectedListener back.
+                mTabLayout.addOnTabSelectedListener(this);
             }
         }
     }
 
     @CalledByNative
     private void setNativePtr(long nativePtr) {
         mNativeTranslateInfoBarPtr = nativePtr;
     }
 
     @Override
@@ skipping 70 matching lines @@
             mTabLayout.replaceTabTitle(SOURCE_TAB_INDEX, mOptions.getRepresentationFromCode(code));
             startTranslating(mTabLayout.getSelectedTabPosition());
         }
     }
 
     private native void nativeApplyStringTranslateOption(
             long nativeTranslateCompactInfoBar, int option, String value);
     private native void nativeApplyBoolTranslateOption(
             long nativeTranslateCompactInfoBar, int option, boolean value);
 }