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

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

Index: third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h
diff --git a/third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h b/third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h
index a2fe805e9199e3193bb809334ad9f5ee92d9bd6d..2ebc865dbb3eb836b19838985052f85e7e17c8f5 100644
--- a/third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h
+++ b/third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h
@@ -118,6 +118,21 @@ typedef void (*AddressVisitor)(void* data, const void* ptr);
 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