Add Manual Test Case for verification of 
- content type added to clipboard on Drag and Drop operation
- content type added to clipboard on `Copy To Clipboard` of image operation of context menu
            
- content type added to clipboard on Drag and Drop operation
- content type added to clipboard on `Copy To Clipboard` of image operation of context menu
- relates to
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                    JDK-8187671 [WebView] Drag and Drop of text or html results in an image -           
- Resolved
 
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- 
                    JDK-8187928 [WebView] Images copied from clipboard not written in source file format -           
- Resolved
 
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- 
                    JDK-8189872 Cleanup whitespace after fix for JDK-8188111 -           
- Resolved
 
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- 
                    JDK-8187726 [WebView] Copy and Paste of Image not resulting in expected behavior -           
- Resolved
 
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