Add _android files for building DartVM on Android

runtime/vm/debuginfo_android.cc

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, 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/debuginfo.h"
 
+
 namespace dart {
 
 DebugInfo::DebugInfo() {
   handle_ = NULL;
 }
 
 
 DebugInfo::~DebugInfo() {
 }
 
 
 void DebugInfo::AddCode(uword pc, intptr_t size) {
-  // Nothing to do as there is no support for this on macos.
+  // Nothing to do as there is no support for this on Android.
 }
 
 
 void DebugInfo::AddCodeRegion(const char* name, uword pc, intptr_t size) {
-  // Nothing to do as there is no support for this on macos.
+  // Nothing to do as there is no support for this on Android.
 }
 
 
 bool DebugInfo::WriteToMemory(ByteBuffer* region) {
-  // Nothing to do as there is no support for this on macos.
+  // Nothing to do as there is no support for this on Android.
   return false;
 }
 
 
 DebugInfo* DebugInfo::NewGenerator() {
   return new DebugInfo();
 }
 
 
 void DebugInfo::RegisterSection(const char* name,
                                 uword entry_point,
                                 intptr_t size) {
-  // Nothing to do as there is no support for this on macos.
+  // Nothing to do as there is no support for this on Android.
 }
 
 
 void DebugInfo::UnregisterAllSections() {
-  // Nothing to do as there is no support for this on macos.
+  // Nothing to do as there is no support for this on Android.
 }
 
 }  // namespace dart