Let Android port access properly sized images

chrome/browser/android/resource_mapper.cc

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/android/resource_mapper.h"
+
+#include <map>
+
+#include "base/lazy_instance.h"
+#include "base/logging.h"
+#include "grit/theme_resources.h"
+
+namespace {
+
+typedef std::map<int, int> ResourceMap;
+base::LazyInstance<ResourceMap>::Leaky g_id_map = LAZY_INSTANCE_INITIALIZER;
+
+} // namespace
+
+const int ResourceMapper::kMissingId = -1;
+
+int ResourceMapper::MapFromChromiumId(int resource_id) {
+  if (g_id_map.Get().empty()) {
+    ConstructMap();
+  }
+
+  ResourceMap::iterator iterator = g_id_map.Get().find(resource_id);
+  if (iterator != g_id_map.Get().end()) {
+    return iterator->second;
+  }
+
+  // The resource couldn't be found.
+  NOTREACHED();
+  return kMissingId;
+}
+
+void ResourceMapper::ConstructMap() {
+  DCHECK(g_id_map.Get().empty());
+  int next_id = 0;
+
+#define DEFINE_RESOURCE_ID(c_id,java_id) g_id_map.Get()[c_id] = next_id++;
+#include "chrome/browser/android/resource_id.h"
+#undef DEFINE_RESOURCE_ID
+}