Let Android port access properly sized images

chrome/browser/android/resource_mapper.cc

Index: chrome/browser/android/resource_mapper.cc
diff --git a/chrome/browser/android/resource_mapper.cc b/chrome/browser/android/resource_mapper.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a7db2627b5ba1333f6c1acb11a7e7aae48dc15db
--- /dev/null
+++ b/chrome/browser/android/resource_mapper.cc
@@ -0,0 +1,40 @@
+// 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/logging.h"
+#include "grit/theme_resources.h"
+
+const int ResourceMapper::kMissingId = -1;
+
+namespace {
+  std::map<int, int> g_id_map;

[Yaron, 2013/05/20 20:54:25]

Don't indent scope under namespace

[gone, 2013/05/20 21:28:04]

Done.

+
+  // Create the mapping.  IDs start at 0 to correspond to the array that gets
+  // built in the corresponding ResourceID Java class.
+  void ConstructMap() {
+    int next_id = 0;

[Yaron, 2013/05/20 20:54:25]

How about DCHECK(g_id_map.empty());

[gone, 2013/05/20 21:28:04]

Done.

+#define DEFINE_RESOURCE_ID(c_id,java_id) g_id_map[c_id] = next_id++;
+#include "chrome/browser/android/resource_id.h"
+#undef DEFINE_RESOURCE_ID
+  }
+}

[Yaron, 2013/05/20 20:54:25]

  // namespace

[gone, 2013/05/20 21:28:04]

Done.

+
+int ResourceMapper::MapFromChromiumId(int resource_id) {
+  if (g_id_map.empty()) {
+    ConstructMap();
+  }
+
+  std::map<int, int>::iterator iterator = g_id_map.find(resource_id);
+  if (iterator != g_id_map.end()) {
+    return iterator->second;
+  }
+
+  // The resource couldn't be found.
+  NOTREACHED();
+  return kMissingId;
+}