[Android] Support unfocusable container views.

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.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.content.browser;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.app.SearchManager;
 import android.content.ClipboardManager;
@@ skipping 2351 matching lines @@
 
     /**
      * @see View#hasFocus()
      */
     @CalledByNative
     public boolean hasFocus() {
         return mContainerView.hasFocus();
     }
 
     /**
+     * @see View#isFocusable()
+     */
+    @CalledByNative
+    public boolean isFocusable() {
+        return mContainerView.isFocusable();
+    }
+
+    /**
      * Checks whether the ContentViewCore can be zoomed in.
      *
      * @return True if the ContentViewCore can be zoomed in.
      */
     // This method uses the term 'zoom' for legacy reasons, but relates
     // to what chrome calls the 'page scale factor'.
     public boolean canZoomIn() {
         final float zoomInExtent = mRenderCoordinates.getMaxPageScaleFactor()
                 - mRenderCoordinates.getPageScaleFactor();
         return zoomInExtent > ZOOM_CONTROLS_EPSILON;
@@ skipping 646 matching lines @@
     private native void nativeWasResized(long nativeContentViewCoreImpl);
 
     private native void nativeSetAccessibilityEnabled(
             long nativeContentViewCoreImpl, boolean enabled);
 
     private native void nativeExtractSmartClipData(long nativeContentViewCoreImpl,
             int x, int y, int w, int h);
 
     private native void nativeSetBackgroundOpaque(long nativeContentViewCoreImpl, boolean opaque);
 }