Move ExtensionActionStorageManager out of extension_action_api.*

extensions/common/constants.h

Index: extensions/common/constants.h
diff --git a/extensions/common/constants.h b/extensions/common/constants.h
index 3dde500ab35891661f2d81228d3750a225c3efa5..3e9f17b9ef4811ae5ba5c1ececcde4a13f0c25f6 100644
--- a/extensions/common/constants.h
+++ b/extensions/common/constants.h
@@ -7,6 +7,7 @@
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
+#include "ui/base/layout.h"
 
 namespace extensions {
 
@@ -128,9 +129,19 @@ enum ExtensionIcons {
 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