Create WebInbandTextTrack and WebInbandTextTrackClient

Source/WebKit/chromium/src/WebInbandTextTrackClientImpl.cpp

+#include "WebInbandTextTrackClientImpl.h"
+
+#include <wtf/ExportMacros.h>
+#include <wtf/text/WTFString.h>
+#include "InbandTextTrackPrivateClient.h"
+#define WEBKIT_IMPLEMENTATION 1
+#include "third_party/WebKit/Source/Platform/chromium/public/WebString.h"
+
+namespace WebKit {
+
+WebInbandTextTrackClientImpl::WebInbandTextTrackClientImpl(
+    WebCore::InbandTextTrackPrivateClient* client)
+    : m_client(client)
+{
+  ASSERT(client);
+}
+
+void WebInbandTextTrackClientImpl::addWebVTTCue(
+    WebCore::InbandTextTrackPrivate* track,
+    double start,
+    double end,
+    const WebString& id,
+    const WebString& content,
+    const WebString& settings)
+{
+  m_client->addWebVTTCue(track, start, end, id, content, settings);
+}
+
+}  // namespace WebKit