Bug: 7226877
Change-Id: Ib6c32bfee9977c27dbf7e1e590b2b00d9ceb7301

This adds a number to the extension.

Note that for DownloadManager to keep this, the server
needs to send it a mime type it does not recognize. Right
now, it does not recognize application/json so it's okay,
but we'd do well to remove the content/type header from
the server to prevent problems.

Bug: 8467516
Change-Id: Ic484f66ac3f67c36f59f2c0bcb8c7fdeb6e8590d

Bug: 7600384
Change-Id: I8009b31d96646acd667db410b94e969daea91d52

Bug: 8715614
Change-Id: I307d83923070994525cf0d27aad403e881a89314

Bug: 8624690
Change-Id: I8946d6618609c8e0cb638aa96992b51b435232c7

Bug: 8600958

Change-Id: Ic472500406b9d54ec4052c490ee7cef62fc4e52a

Handling buttons directly in the preference causes large
problems of code readability and interface.  It's better to
have a class to manage the buttons and their animations
separately. This is feature-equivalent, and mostly
delegates stuff for now.

Bug: 7600384
Change-Id: Ia8da0ec68ffac84fc1d65e1760539a87a73fa776

Change-Id: Iefa9cf774c772bc113d481199a0a9c564a0aba27
Auto-generated-cl: translation import

This is more readable and will help with animations going forward.

Bug: 7600384
Change-Id: I255598d860d1e451fef106b00da63c282fe95f95

The life span of this object is actually the life span of the interface.
It should not be static.
Also, we'll have a few other things to store in there soon.

Bug: 7600384
Change-Id: I708019e9ee53653e83a1e52c8e76326c3e39bcf3

By looping through children, there is no need to remember the
last index.

Bug: 7600384
Change-Id: I8b42b0aa38874ee494c6c4ecc09194a1d3c16922

The button would not display after it got hidden once.

Bug: 7600384
Change-Id: I57f9f1191be3b8fff55dde7a2781dbef68a2df62

Bug: 8624690
Change-Id: If59305674a781e0fcc284d236e3d8ba9cdf9ed08

Bug: 8159728
Change-Id: Ia37ab32b63e4eda29bf1411719d00846525c278f

Bug: 8159728
Change-Id: Ic2206d50562d62578f8e5e50bbd3c36625dbafb7

Bug: 8701480
Change-Id: If8242cfe61f3e56712fd6e25e36858cff7f0d177

Bug: 8159728
Change-Id: I1ab846d0910aacbd2f979289d72bafea8a8e0378

This is a follow up of Ie8e058bc3c.

Bug: 8159728
Change-Id: I171fc99374789e69c15506c37970e6fcafbcb1e2

* commit 'e55ae342':
  Disable shadow of gesture trail (DO NOT MERGE)

* commit '0e5b6384':
  Disable shadow of gesture trail (DO NOT MERGE)

* commit '6b87e270':
  Import translations. DO NOT MERGE

This preference is not a DialogPreference any more, as it doesn't
ever display a Dialog.

Bug: 7600384
Change-Id: Ia5965617c83d3cb964010f9b40d833065dccef60

* commit 'fc036454':
  Import translations. DO NOT MERGE

Bug: 8689880
Change-Id: I908c22d362f2f6f07e5e04be14d3aaa749a8ac8e