Fuchsia: Memory reservation and partial unmapping

runtime/vm/virtual_memory_android.cc

Index: runtime/vm/virtual_memory_android.cc
diff --git a/runtime/vm/virtual_memory_android.cc b/runtime/vm/virtual_memory_android.cc
index 7406d22d438288b728efce07bb5482b76e61daff..bae5a82d5d39d75f16b03234ac22c61753d78055 100644
--- a/runtime/vm/virtual_memory_android.cc
+++ b/runtime/vm/virtual_memory_android.cc
@@ -60,7 +60,9 @@ VirtualMemory::~VirtualMemory() {
 }
 
 
-bool VirtualMemory::FreeSubSegment(void* address, intptr_t size) {
+bool VirtualMemory::FreeSubSegment(int32_t handle,
+                                   void* address,
+                                   intptr_t size) {
   unmap(address, size);
   return true;
 }