Add content_browsertests for testing cache control flags

content/public/test/content_browser_test_utils.h

Index: content/public/test/content_browser_test_utils.h
diff --git a/content/public/test/content_browser_test_utils.h b/content/public/test/content_browser_test_utils.h
index 19a003494890412f9442b6183a37bf3a5ec7d369..47b2c07c7ed2ab487bea6a40880fb58890cd765f 100644
--- a/content/public/test/content_browser_test_utils.h
+++ b/content/public/test/content_browser_test_utils.h
@@ -69,6 +69,12 @@ bool NavigateToURLAndExpectNoCommit(Shell* window, const GURL& url);
 void ReloadBlockUntilNavigationsComplete(Shell* window,
                                          int number_of_navigations);
 
+// Reloads |window| with bypassing cache flag, and blocks until the given number
+// of navigations finishes.
+void ReloadBypassingCacheBlockUntilNavigationsComplete(
+    Shell* window,
+    int number_of_navigations);
+
 // Wait until an application modal dialog is requested.
 void WaitForAppModalDialog(Shell* window);