Implement a ScopedThreadHeapUsage class to allow profiling per-thread heap usage.

base/allocator/winheap_stubs_win.h

Index: base/allocator/winheap_stubs_win.h
diff --git a/base/allocator/winheap_stubs_win.h b/base/allocator/winheap_stubs_win.h
index 4422283c901433a946d57bb0aa559268ce7552a6..422dfe0da762049b6cb51c788ac3338a982fe721 100644
--- a/base/allocator/winheap_stubs_win.h
+++ b/base/allocator/winheap_stubs_win.h
@@ -21,9 +21,13 @@ extern bool g_is_win_shim_layer_initialized;
 // Thin wrappers to implement the standard C allocation semantics on the
 // CRT's Windows heap.
 void* WinHeapMalloc(size_t size);
-void WinHeapFree(void* size);
+void WinHeapFree(void* ptr);
 void* WinHeapRealloc(void* ptr, size_t size);
 
+// Returns a lower-bound estimate for the full amount of memory consumed by the
+// the allocation |ptr|.
+size_t WinHeapGetSizeEstimate(void* ptr);
+
 // Call the new handler, if one has been set.
 // Returns true on successfully calling the handler, false otherwise.
 bool WinCallNewHandler(size_t size);