Expose text track settings in Content and implement for Android

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

Index: content/public/android/java/src/org/chromium/content/browser/accessibility/captioning/SystemCaptioningBridge.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/accessibility/captioning/SystemCaptioningBridge.java b/content/public/android/java/src/org/chromium/content/browser/accessibility/captioning/SystemCaptioningBridge.java
new file mode 100644
index 0000000000000000000000000000000000000000..55eb5afb07b409effc1a038c5b7c80f2aa753374
--- /dev/null
+++ b/content/public/android/java/src/org/chromium/content/browser/accessibility/captioning/SystemCaptioningBridge.java
@@ -0,0 +1,21 @@
+// 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;
+
+/**
+ * Interface for platform dependent captioning bridges.
+ */
+public interface SystemCaptioningBridge {
+    /**
+     * Calls all of the delegate's methods with the system's current captioning settings.
+     */
+    public void syncToDelegate();
+
+    /**
+     * Removes any external listeners that were added. This implementation doesn't do anything.
+     * After destroy is called, this object should not be used again.
+     */
+    public void destroy();
+}