Bitmap::Crop: When the rectangle is entire bitmap, do nothing
Bitmap::Crop: When the rectangle is entire bitmap, do nothing

It is expensive to rewrite the whole bitmap with the same content.

Change-Id: I001210840d535ac54837fff092c90835f9f2f547

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core