Add mips skeleton sources.

runtime/vm/stack_frame_mips.cc

Index: runtime/vm/stack_frame_mips.cc
===================================================================
--- runtime/vm/stack_frame_mips.cc	(revision 0)
+++ runtime/vm/stack_frame_mips.cc	(revision 0)
@@ -0,0 +1,47 @@
+// Copyright (c) 2013, 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_ARCH_MIPS)
+
+#include "vm/stack_frame.h"
+
+namespace dart {
+
+intptr_t StackFrame::PcAddressOffsetFromSp() {
+  UNIMPLEMENTED();
+  return 0;
+}
+
+
+uword StackFrame::GetCallerFp() const {
+  UNIMPLEMENTED();
+  return 0;
+}
+
+
+uword StackFrame::GetCallerSp() const {
+  UNIMPLEMENTED();
+  return 0;
+}
+
+
+intptr_t EntryFrame::ExitLinkOffset() {
+  UNIMPLEMENTED();
+  return 0;
+}
+
+
+void StackFrameIterator::SetupLastExitFrameData() {
+  UNIMPLEMENTED();
+}
+
+
+void StackFrameIterator::SetupNextExitFrameData() {
+  UNIMPLEMENTED();
+}
+
+}  // namespace dart
+
+#endif  // defined TARGET_ARCH_MIPS