SelectAllOnFocus shows a higlighted text. DO NOT MERGE.

Bug 3201383

Highlighted is different from selected, only the background is modified
and selection mode is not started.

Tapping inside a highlighted text places the cursor. This is especially
useful for WebView and search bar has been modified to select all on focus.

Selection handles time out is no longer needed.

This CL is pretty involved and especially messes up with the terrible
ExtractedTextView, which causes a lot of problem with text selection
across device rotations.

The current implementation works pretty well. It has one problem: the handles
are not displayed when switching to landscape mode with a selected text.

This is still an improvement over the current GB version, where the handles
are not preserved at all across device rotation and where I can find more bugs.

Handles are now hidden when a context menu is displayed.

I can polish this more if we decide to include this in the MR1.

Change-Id: Id10bf2808ff25752efd59a1987e91d609ba478cd