Fix the incorrect native ImeAdapter attach and detach.

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

 // Copyright (c) 2012 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.content.browser;
 
 import android.app.Activity;
 import android.content.Context;
 import android.content.pm.ActivityInfo;
 import android.content.pm.PackageManager;
@@ skipping 2199 matching lines @@
 
     @SuppressWarnings("unused")
     @CalledByNative
     private void onWebContentsConnected() {
         if (mImeAdapter != null &&
                 !mImeAdapter.isNativeImeAdapterAttached() && mNativeContentViewCore != 0) {
             mImeAdapter.attach(nativeGetNativeImeAdapter(mNativeContentViewCore));
         }
     }
 
+    @SuppressWarnings("unused")
+    @CalledByNative
+    private void onWebContentsSwapped() {
+        if (mImeAdapter != null && mNativeContentViewCore != 0) {
+            mImeAdapter.attach(nativeGetNativeImeAdapter(mNativeContentViewCore));
+        }
+    }
+
     /**
      * @return Whether a reload happens when this ContentView is activated.
      */
     public boolean needsReload() {
         return mNativeContentViewCore != 0 && nativeNeedsReload(mNativeContentViewCore);
     }
 
     /**
      * @see View#hasFocus()
      */
@@ skipping 578 matching lines @@
             boolean enableHiding, boolean enableShowing, boolean animate);
 
     private native void nativeShowImeIfNeeded(int nativeContentViewCoreImpl);
 
     private native void nativeAttachExternalVideoSurface(
             int nativeContentViewCoreImpl, int playerId, Surface surface);
 
     private native void nativeDetachExternalVideoSurface(
             int nativeContentViewCoreImpl, int playerId);
 }