Fix tab backgrounding on Linux / ChromeOS

content/browser/renderer_host/render_process_host_browsertest.h

Index: content/browser/renderer_host/render_process_host_browsertest.h
diff --git a/content/browser/renderer_host/render_process_host_browsertest.h b/content/browser/renderer_host/render_process_host_browsertest.h
index 9b7e1732ba4d500ed6dd7ec177362c7defe719eb..58d9f512a42f817d9150ba9984e609b26a1ca708 100644
--- a/content/browser/renderer_host/render_process_host_browsertest.h
+++ b/content/browser/renderer_host/render_process_host_browsertest.h
@@ -6,13 +6,18 @@
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_BROWSERTEST_H_
 #pragma once
 
+#include "base/process.h"
 #include "chrome/test/base/in_process_browser_test.h"
 
+
+class GURL;
+
 class RenderProcessHostTest : public InProcessBrowserTest {
  public:
   RenderProcessHostTest();
 
   int RenderProcessHostCount();
+  base::ProcessHandle ShowSingletonTab(const GURL& page);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_BROWSERTEST_H_