[Android] Support unfocusable container views.

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

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 12e658bee619c6abd9f161af5d9551f39a7a8ac4..351e0dc10b998c500b274675242f67d92efe44fe 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -2369,6 +2369,14 @@ public class ContentViewCore
     }
 
     /**
+     * @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.