Activate xdg-shell, so the "minimize" button works under Tizen

We enable the build-time option "xdg-shell" for Tizen. Tested OK
with the latest Tizen Common & IVI images, it should work reliably
with upcoming snapshots & releases as we are taking care of
protocol versions compatibility.

BUG=XWALK-1382

Signed-off-by: Manuel Bachmann <manuel.bachmann@open.eurogiciel.org>
[Android] Hide classes and description refinement for Javadoc.

This fix aims to use Doclava(https://code.google.com/p/doclava/) to
generate java doc for embedding API. Since some classes and methods
are public but not generated as API, "@hide" is used from Doclava.
Besides, it refines some description and comments. Next is to enable
doclava in Crosswalk.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1544
[Android] Add the param of mode for reload function

The reload function of XWalkView needs a param to set the reload
mode.
We support two types at present(NORMAL and IGNORE_CACHE), and we
will add more by demand.

BUG=XWALK-1543
Merge pull request #1847 from xingnan/reload-type

[Android] Add the param of type for reload function
Merge pull request #1851 from Tarnyko/tizen_xdg

Activate xdg-shell, so the "minimize" button works under Tizen
Merge pull request #1848 from yongsheng/fix1544

[Android] Hide classes and description refinement for Javadoc.
[application] application installation should not cause termination of all the running apps

Before the change installation of any application, having the main document,
caused xwalk process termination (and hence termination of all the running
applications).
This patch fixes it so that only the installation-related application is
terminated and the rest applications remain being active.
Bump version to 6.35.126.0
[Extension] Fix ";" typo after if-clause

It will cause process_.reset() runs every time.
[Tizen][Runtime] Add support for Tizen Metadata.

'metadata' element supports metadata information shared with other web
applications. The defined metadata can be accessed (read-only) through
the Tizen Application API.

BUG=XWALK-1495
Merge pull request #1857 from seanlong/fix_typo

[Extension] Fix ";" typo after if-clause
DEPS.xwalk: Roll chromium-crosswalk (d233df47 -> e625828).

e625828 Merge pull request #152 from qjia7/enable_auto_play
a5bbe0e [Tizen] Enable media auto play
Merge pull request #1854 from qjia7/roll_deps

DEPS.xwalk: Roll chromium-crosswalk (d233df47 -> e625828).
Merge pull request #1852 from pozdnyakov/Install_with_main_doc

[application] application installation causes termination of all the running apps
Merge pull request #1843 from shaochangbin/metadata

[Tizen][Runtime] Add support for Tizen Metadata.
[application] Do not interrupt XWalk service

Do not quit XWalk process after the last application
terminated, if XWalk was launched in service mode.
Merge pull request #1858 from pozdnyakov/do_not_interrupt_xwalk_service

[application] Do not interrupt XWalk service
Fix Windows build.

- Adapt to API changes.
- Fix of string manipulation.
- Compile out a switch case with no case but just a default (MSVC doesn't
  like this).
Merge pull request #1859 from darktears/win-build-fix

Fix Windows build.
Bump version to 6.35.127.0