[Tracing] Enable heap dumps with both type info and backtraces

base/trace_event/heap_profiler_allocation_context.h

Index: base/trace_event/heap_profiler_allocation_context.h
diff --git a/base/trace_event/heap_profiler_allocation_context.h b/base/trace_event/heap_profiler_allocation_context.h
index 6a46d03e73b644799b345563d4e6707e75aba6d5..a7f1e9dca9031a9e62a877226cb28ca27480b5ba 100644
--- a/base/trace_event/heap_profiler_allocation_context.h
+++ b/base/trace_event/heap_profiler_allocation_context.h
@@ -82,12 +82,12 @@ bool BASE_EXPORT operator==(const AllocationContext& lhs,
 namespace BASE_HASH_NAMESPACE {
 
 template <>
-struct hash<base::trace_event::Backtrace> {
+struct BASE_EXPORT hash<base::trace_event::Backtrace> {
   size_t operator()(const base::trace_event::Backtrace& backtrace) const;
 };
 
 template <>
-struct hash<base::trace_event::AllocationContext> {
+struct BASE_EXPORT hash<base::trace_event::AllocationContext> {
   size_t operator()(const base::trace_event::AllocationContext& context) const;
 };