Enable media stream layout test with content_shell.

content/shell/webkit_test_runner.cc

Index: content/shell/webkit_test_runner.cc
===================================================================
--- content/shell/webkit_test_runner.cc	(revision 191981)
+++ content/shell/webkit_test_runner.cc	(working copy)
@@ -58,6 +58,7 @@
 #include "webkit/glue/glue_serialize.h"
 #include "webkit/glue/webkit_glue.h"
 #include "webkit/glue/webpreferences.h"
+#include "webkit/mocks/test_media_stream_client.h"
 
 using WebKit::Platform;
 using WebKit::WebArrayBufferView;
@@ -68,6 +69,8 @@
 using WebKit::WebFrame;
 using WebKit::WebGamepads;
 using WebKit::WebHistoryItem;
+using WebKit::WebMediaPlayer;
+using WebKit::WebMediaPlayerClient;
 using WebKit::WebPoint;
 using WebKit::WebRect;
 using WebKit::WebSize;
@@ -489,6 +492,17 @@
   history->swap(result);
 }
 
+WebMediaPlayer* WebKitTestRunner::createWebMediaPlayer(
+    WebFrame* frame, const WebURL& url, WebMediaPlayerClient* client)
+{
+  if (!test_media_stream_client_.get()) {
+    test_media_stream_client_.reset(
+        new webkit_glue::TestMediaStreamClient());
+  }
+  return webkit_glue::CreateMediaPlayer(
+      frame, url, client, test_media_stream_client_.get());
+}
+
 // RenderViewObserver  --------------------------------------------------------
 
 void WebKitTestRunner::DidClearWindowObject(WebFrame* frame) {