[android_webview] Correctly handle ContextWrapper in AwContents.

android_webview/java/src/org/chromium/android_webview/AwContents.java

 // Copyright 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.android_webview;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.content.ComponentCallbacks2;
 import android.content.Context;
@@ skipping 775 matching lines @@
         // TODO(joth): when the native and java counterparts of AwBrowserContext are hooked up to
         // each other, we should update |mBrowserContext| according to the newly received native
         // WebContent's browser context.
 
         // The native side object has been bound to this java instance, so now is the time to
         // bind all the native->java relationships.
         mCleanupReference = new CleanupReference(this, new DestroyRunnable(mNativeAwContents));
 
         long nativeWebContents = nativeGetWebContents(mNativeAwContents);
 
-        mWindowAndroid = mContext instanceof Activity
-                ? new ActivityWindowAndroid((Activity) mContext)
+        Activity activity = ContentViewCore.activityFromContext(mContext);
+        mWindowAndroid = activity != null
+                ? new ActivityWindowAndroid(activity)
                 : new WindowAndroid(mContext.getApplicationContext());
         mContentViewCore = createAndInitializeContentViewCore(
                 mContainerView, mContext, mInternalAccessAdapter, nativeWebContents,
                 new AwGestureStateListener(), mContentViewClient, mZoomControls, mWindowAndroid);
         nativeSetJavaPeers(mNativeAwContents, this, mWebContentsDelegate, mContentsClientBridge,
                 mIoThreadClient, mInterceptNavigationDelegate);
         mWebContents = mContentViewCore.getWebContents();
         mNavigationController = mWebContents.getNavigationController();
         installWebContentsObserver();
         mSettings.setWebContents(nativeWebContents);
@@ skipping 1870 matching lines @@
 
     private native void nativePreauthorizePermission(long nativeAwContents, String origin,
             long resources);
 
     private native void nativePostMessageToFrame(long nativeAwContents, String frameId,
             String message, String sourceOrigin, String targetOrigin, int[] msgPorts);
 
     private native void nativeCreateMessageChannel(long nativeAwContents,
             ValueCallback<MessageChannel> callback);
 }