[Chromecast] Set dummy metrics session ID for browser tests

chromecast/browser/test/chromecast_browser_test.cc

 // Copyright 2014 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.
 
 #include "chromecast/browser/test/chromecast_browser_test.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
+#include "chromecast/base/metrics/cast_metrics_helper.h"
 #include "chromecast/browser/cast_browser_context.h"
 #include "chromecast/browser/cast_browser_process.h"
 #include "chromecast/browser/cast_content_window.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/test_navigation_observer.h"
 
 namespace chromecast {
@@ skipping 42 matching lines @@
 }
 
 content::WebContents* ChromecastBrowserTest::CreateBrowser() {
   window_.reset(new CastContentWindow);
   gfx::Size initial_size(1280, 720);
 
   web_contents_ = window_->CreateWebContents(
       initial_size,
       CastBrowserProcess::GetInstance()->browser_context());
   window_->CreateWindowTree(initial_size, web_contents_.get());
+
+  metrics::CastMetricsHelper::GetInstance()->SetDummySessionIdForTesting();
+
   return web_contents_.get();
 }
 
 }  // namespace shell
 }  // namespace chromecast