Pepper: Add a X-Requested-With header to URL requests done for Pepper plugins.

ppapi/tests/test_url_loader.cc

Index: ppapi/tests/test_url_loader.cc
diff --git a/ppapi/tests/test_url_loader.cc b/ppapi/tests/test_url_loader.cc
index 90244912681fc7c77d24b1746db811fa62ff8205..889a4d0ffba67aaf6d5175311dad6e12bc501334 100644
--- a/ppapi/tests/test_url_loader.cc
+++ b/ppapi/tests/test_url_loader.cc
@@ -841,5 +841,17 @@ std::string TestURLLoader::TestPrefetchBufferThreshold() {
   PASS();
 }
 
+// TODO(viettrungluu): This test properly belongs elsewhere. It tests that
+// Chrome properly tags URL requests made on behalf of Pepper plugins (with an
+// X-Requested-With header), but this isn't, strictly speaking, a PPAPI
+// behavior.
+std::string TestURLLoader::TestXRequestedWithHeader() {
+  pp::URLRequestInfo request(instance_);
+  request.SetURL("/echoheader?X-Requested-With");
+  // The name and version of the plugin is set from the command-line (see
+  // chrome/test/ppapi/ppapi_test.cc.
+  return LoadAndCompareBody(request, "PPAPI Tests 1.2.3");
+}
+
 // TODO(viettrungluu): Add tests for  Get{Upload,Download}Progress, Close
 // (including abort tests if applicable).