[Android] Add support for a hung renderer dialog

chrome/android/java/src/org/chromium/chrome/browser/tab/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.tab;
 
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.content.res.Resources;
@@ skipping 457 matching lines @@
                 String frameName, String targetUrl, WebContents newWebContents) {
             for (TabObserver observer : mObservers) {
                 observer.webContentsCreated(Tab.this, sourceWebContents, openerRenderFrameId,
                         frameName, targetUrl, newWebContents);
             }
         }
 
         @Override
         public void rendererUnresponsive() {
             super.rendererUnresponsive();
+            if (mNativeTabAndroid != 0) nativeOnRendererUnresponsive(mNativeTabAndroid);
             if (mFullscreenManager == null) return;
             mFullscreenHungRendererToken =
                     mFullscreenManager.showControlsPersistentAndClearOldToken(
                             mFullscreenHungRendererToken);
         }
 
         @Override
         public void rendererResponsive() {
             super.rendererResponsive();
+            if (mNativeTabAndroid != 0) nativeOnRendererResponsive(mNativeTabAndroid);
             if (mFullscreenManager == null) return;
             mFullscreenManager.hideControlsPersistent(mFullscreenHungRendererToken);
             mFullscreenHungRendererToken = FullscreenManager.INVALID_TOKEN;
         }
 
         @Override
         public boolean isFullscreenForTabOrPending() {
             return mFullscreenManager == null
                     ? false : mFullscreenManager.getPersistentFullscreenMode();
         }
@@ skipping 2379 matching lines @@
     private native String nativeGetOfflinePageOriginalUrl(long nativeTabAndroid);
     private native void nativeSetInterceptNavigationDelegate(long nativeTabAndroid,
             InterceptNavigationDelegate delegate);
     private native void nativeAttachToTabContentManager(long nativeTabAndroid,
             TabContentManager tabContentManager);
     private native void nativeAttachOverlayContentViewCore(long nativeTabAndroid,
             ContentViewCore content, boolean visible);
     private native void nativeDetachOverlayContentViewCore(long nativeTabAndroid,
             ContentViewCore content);
     private native boolean nativeHasPrerenderedUrl(long nativeTabAndroid, String url);
+    private native void nativeOnRendererUnresponsive(long nativeTabAndroid);
+    private native void nativeOnRendererResponsive(long nativeTabAndroid);
 
     private static native void nativeRecordStartupToCommitUma();
 }