Introduce functions to set options in tcmalloc's heap profiler in Chrome for Android.

third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h

 /* Copyright (c) 2005, Google Inc.
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  * 
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 100 matching lines @@
  * to the object being visited.
  */
 typedef void (*AddressVisitor)(void* data, const void* ptr);
 
 /* Iterate over all live allocated objects. For each allocation the
  * callback will be invoked with the data argument and allocation pointer.
  */
 PERFTOOLS_DLL_DECL void IterateAllocatedObjects(AddressVisitor callback,
                                                 void* data);
 
+#if defined(OS_ANDROID)
+// They should be called BEFORE starting heap profiler by HeapProfilerStart.
+//
+// These functions are introduced to use heap profiler in Chrome for Android
+// instead of setting environment variables.  Android applications don't have
+// a good way to use environment variables.
+
+// Note that int is used instead of int64 because base/basictypes.h should not
+// be included under gperftools/.
+
+PERFTOOLS_DLL_DECL void HeapProfilerSetTimeInterval(int time_interval);
+PERFTOOLS_DLL_DECL void HeapProfilerSetMmapProfile(bool mmap_profile);
+PERFTOOLS_DLL_DECL void HeapProfilerSetDeepHeapProfile(bool deep_heap_profile);
+#endif  // defined(OS_ANDROID)
+
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  /* BASE_HEAP_PROFILER_H_ */