Fuchsia: Memory reservation and partial unmapping

runtime/vm/virtual_memory_win.cc

Index: runtime/vm/virtual_memory_win.cc
diff --git a/runtime/vm/virtual_memory_win.cc b/runtime/vm/virtual_memory_win.cc
index de9156ddedb495fb10e171542647d738da080c62..7e876a4281cf8f6fc077a394ac7958116a223e78 100644
--- a/runtime/vm/virtual_memory_win.cc
+++ b/runtime/vm/virtual_memory_win.cc
@@ -44,7 +44,9 @@ VirtualMemory::~VirtualMemory() {
 }
 
 
-bool VirtualMemory::FreeSubSegment(void* address, intptr_t size) {
+bool VirtualMemory::FreeSubSegment(int32_t handle,
+                                   void* address,
+                                   intptr_t size) {
   // On Windows only the entire segment returned by VirtualAlloc
   // can be freed. Therefore we will have to waste these unused
   // virtual memory sub-segments.