Frankly, I don't think China will be able to build a full fledged naval base in Pakistan for some time. Not as long as the USA has leverage over Pakistan. Pak cannot afford to take such a big step against American interests. In principle it should be Pakistan's choice to make, but then we know that in practice the US has a big grip on Pakistan.
Au Contrare, It's not a big grip as such at all. It's the state trying to milk the US for all it can while they do the same while keeping their respective interests. The Big Grip comes on when there are single individuals who can be threatened( mildly put statements like you will no longer be required.. as in you will be either deposed or killed off conveniently)