This general centering issue was filed here: https://bugs.chromium.org/p/chromium/issues/detail?id=598805
For dragging 1px width change: https://bugs.chromium.org/p/chromium/issues/detail?id=598818 See the section below, "Resizing, one pixel at a time".
For the missing resize bars: https://bugs.chromium.org/p/chromium/issues/detail?id=598822 See the section below, "Resize bar is not always available".
For the missing rotate button: https://bugs.chromium.org/p/chromium/issues/detail?id=598829 See the section below, "Rotate not always available"
For the missing "hover" behavior: https://bugs.chromium.org/p/chromium/issues/detail?id=600180 See the added comment below.
In dev tools v48, using device mode, you can still hover over DOM elements and see the CSS :hover effects:
In dev tools v49, all device modes assume touch screen, giving you the circular "touchscreen" pointer, and not showing any "hover" effects:
![dev-tools-hover-chrome-49_1](https://cloud.githubusercontent.com/assets/1313561/14257508/0eeed660-fa6c-11e5-971e-9c9f1bf5f29d.gif)