[tracing] Add browser test for background memory tracing

base/trace_event/trace_config_memory_test_util.h

 // Copyright 2015 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.
 
 #ifndef BASE_TRACE_EVENT_TRACE_CONFIG_MEMORY_TEST_UTIL_H_
 #define BASE_TRACE_EVENT_TRACE_CONFIG_MEMORY_TEST_UTIL_H_
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/memory_dump_manager.h"
 
@@ skipping 54 matching lines @@
           "\"enable_argument_filter\":false,"
           "\"enable_sampling\":false,"
           "\"enable_systrace\":false,"
           "\"included_categories\":["
             "\"%s\""
           "],"
           "\"record_mode\":\"record-until-full\""
         "}", MemoryDumpManager::kTraceCategory);
   }
 
-  static std::string GetTraceConfig_BackgroundTrigger() {
+  static std::string GetTraceConfig_BackgroundTrigger(int period_ms) {
     return StringPrintf(
         "{"
           "\"enable_argument_filter\":false,"
           "\"enable_sampling\":false,"
           "\"enable_systrace\":false,"
           "\"included_categories\":["
             "\"%s\""
           "],"
           "\"memory_dump_config\":{"
              "\"triggers\":["
               "{"
                 "\"mode\":\"background\","
-                "\"periodic_interval_ms\":1"
+                "\"periodic_interval_ms\":%d"
               "}"
             "]"
           "},"
           "\"record_mode\":\"record-until-full\""
-        "}", MemoryDumpManager::kTraceCategory);
+        "}", MemoryDumpManager::kTraceCategory, period_ms);
   }
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_TRACE_CONFIG_MEMORY_TEST_UTIL_H_