Fuchsia: Initial check-in.

runtime/vm/virtual_memory_fuchsia.cc

Index: runtime/vm/virtual_memory_fuchsia.cc
diff --git a/runtime/vm/virtual_memory_fuchsia.cc b/runtime/vm/virtual_memory_fuchsia.cc
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--- /dev/null
+++ b/runtime/vm/virtual_memory_fuchsia.cc
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+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include "vm/globals.h"
+#if defined(TARGET_OS_FUCHSIA)
+
+#include "vm/virtual_memory.h"
+
+#include <unistd.h>  // NOLINT
+
+#include "platform/assert.h"
+#include "vm/os.h"
+
+namespace dart {
+
+uword VirtualMemory::page_size_ = 0;
+
+
+void VirtualMemory::InitOnce() {
+  page_size_ = getpagesize();
+}
+
+
+VirtualMemory* VirtualMemory::ReserveInternal(intptr_t size) {
+  UNIMPLEMENTED();
+  return NULL;
+}
+
+
+VirtualMemory::~VirtualMemory() {
+  UNIMPLEMENTED();
+}
+
+
+bool VirtualMemory::FreeSubSegment(void* address, intptr_t size) {
+  UNIMPLEMENTED();
+  return false;
+}
+
+
+bool VirtualMemory::Commit(uword addr, intptr_t size, bool executable) {
+  UNIMPLEMENTED();
+  return false;
+}
+
+
+bool VirtualMemory::Protect(void* address, intptr_t size, Protection mode) {
+  UNIMPLEMENTED();
+  return false;
+}
+
+}  // namespace dart
+
+#endif  // defined(TARGET_OS_FUCHSIA)