Expose text track settings in Content and implement for Android

content/public/android/java/src/org/chromium/content/browser/accessibility/captioning/CaptioningBridgeFactory.java

Index: content/public/android/java/src/org/chromium/content/browser/accessibility/captioning/CaptioningBridgeFactory.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/accessibility/captioning/CaptioningBridgeFactory.java b/content/public/android/java/src/org/chromium/content/browser/accessibility/captioning/CaptioningBridgeFactory.java
new file mode 100644
index 0000000000000000000000000000000000000000..69372c4b142eb8983000d8ab651037b32a039685
--- /dev/null
+++ b/content/public/android/java/src/org/chromium/content/browser/accessibility/captioning/CaptioningBridgeFactory.java
@@ -0,0 +1,29 @@
+// Copyright 2015 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.accessibility.captioning;
+
+import android.os.Build;
+
+import org.chromium.content.browser.ContentViewCore;
+
+/**
+ * Returns the best captions bridge available.  If the API level is lower than KitKat, a no-op
+ * bridge is returned since those systems didn't support this functionality.
+ */
+public class CaptioningBridgeFactory {
+    /**
+     * Create and return the best SystemCaptioningBridge available.
+     *
+     * @param contentViewCore the ContentViewCore to create the bridge with
+     * @return the best SystemCaptioningBridge available.
+     */
+    public static SystemCaptioningBridge create(ContentViewCore contentViewCore) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
+            return new KitKatCaptioningBridge(contentViewCore);
+        }
+        // On older systems, return a CaptioningBridge that does nothing.
+        return new EmptyCaptioningBridge();
+    }
+}