Let Android port access properly sized images

chrome/browser/android/resource_mapper.h

+// Copyright 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.
+
+#ifndef CHROME_BROWSER_ANDROID_RESOURCE_MAPPER_H_
+#define CHROME_BROWSER_ANDROID_RESOURCE_MAPPER_H_
+
+#include <map>
+
+// Enumerates IDs of resources used in the Android port of Chromium.  This is
+// needed so that Android knows which Drawable is needed in the Java UI.
+class ResourceMapper {
+ public:
+  // ID indicating that the map failed to find a Drawable corresponding to the
+  // Chromium resource.
+  static const int kMissingId;
+
+  // Converts the given chromium |resource_id| (e.g. IDR_INFOBAR_TRANSLATE) to
+  // an enumerated ID.  Returns |kMissingId| if a mapping wasn't found.
+  static int MapFromChromiumId(int resource_id);
+
+ private:
+  // Create the mapping.  IDs start at 0 to correspond to the array that gets
+  // built in the corresponding ResourceID Java class.
+  static void ConstructMap();
+};
+
+#endif  // CHROME_BROWSER_ANDROID_RESOURCE_MAPPER_H_