Move ExtensionActionStorageManager out of extension_action_api.*

extensions/common/constants.h

 // Copyright (c) 2012 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 EXTENSIONS_COMMON_CONSTANTS_H_
 #define EXTENSIONS_COMMON_CONSTANTS_H_
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
+#include "ui/base/layout.h"
 
 namespace extensions {
 
 // Scheme we serve extension content from.
 extern const char kExtensionScheme[];
 
 // Canonical schemes you can use as input to GURL.SchemeIs().
 extern const char kExtensionResourceScheme[];
 
 // The name of the manifest inside an extension.
@@ skipping 101 matching lines @@
   EXTENSION_ICON_SMALLISH = 24,
   EXTENSION_ICON_ACTION = 19,
   EXTENSION_ICON_BITTY = 16,
   EXTENSION_ICON_INVALID = 0,
 };
 
 // List of sizes for extension icons that can be defined in the manifest.
 extern const int kExtensionIconSizes[];
 extern const size_t kNumExtensionIconSizes;
 
-// List of sizes for extension icons that can be defined in the manifest.
-extern const int kExtensionActionIconSizes[];
-extern const size_t kNumExtensionActionIconSizes;
+struct IconRepresentationInfo {
+  // Size in pixels.
+  const int size;
+  // Size as a string that will be used to retrieve representation value from
+  // ExtensionAction SetIcon function arguments.
+  const char* const size_string;
+  // Scale factor for which the representation should be used.
+  const ui::ScaleFactor scale;
+};
+
+// The icon representations for extension actions.
+extern const IconRepresentationInfo kExtensionActionIconSizes[];
+const size_t kNumExtensionActionIconSizes = 2u;
 
 }  // namespace extension_misc
 
 #endif  // EXTENSIONS_COMMON_CONSTANTS_H_