Modify SetImageData to add additional items along with image data to save on clipboard.

extensions/browser/api/clipboard/clipboard_api.h

Index: extensions/browser/api/clipboard/clipboard_api.h
diff --git a/extensions/browser/api/clipboard/clipboard_api.h b/extensions/browser/api/clipboard/clipboard_api.h
index 00be111d57453fe3e868f8e426d471bd97d4c702..b36340ed55bad69b5d6303808683f7d65e5e579b 100644
--- a/extensions/browser/api/clipboard/clipboard_api.h
+++ b/extensions/browser/api/clipboard/clipboard_api.h
@@ -5,6 +5,8 @@
 #ifndef EXTENSIONS_BROWSER_API_CLIPBOARD_CLIPBOARD_API_H_
 #define EXTENSIONS_BROWSER_API_CLIPBOARD_CLIPBOARD_API_H_
 
+#include <vector>
+
 #include "extensions/browser/browser_context_keyed_api_factory.h"
 #include "extensions/browser/extension_function.h"
 #include "extensions/common/api/clipboard.h"
@@ -12,6 +14,8 @@
 
 namespace extensions {
 
+using AdditionalDataItemList = std::vector<api::clipboard::AdditionalDataItem>;
+
 class ClipboardAPI : public BrowserContextKeyedAPI,
                      public ui::ClipboardObserver {
  public:
@@ -43,6 +47,9 @@ class ClipboardSetImageDataFunction : public UIThreadExtensionFunction {
 
   void OnSaveImageDataSuccess();
   void OnSaveImageDataError(const std::string& error);
+
+ private:
+  bool IsAdditionalItemsParamValid(const AdditionalDataItemList& items);
 };
 
 }  // namespace extensions