[Tizen][Runtime] Enable "allow-navigation" feature for Tizen legacy WGT package.

In Tizen WGT package configure document, the <tizen:allow-nevigation>
tag will list all allowed domains of navigation links can be displayed
in web application.

Please refer to the section "0260 Tizen Navigation Policy"
https://source.tizen.org/sites/default/files/page/tizen-2.2-wrt-core-spec.pdf
for more details.
DEPS.xwalk: Roll ozone-wayland (39d93a6 -> a4e3e96).

a4e3e96 Build Fix.
282d501 Backport parts of 08cd65ef and 7f2153f3.
5c7b2cd OzoneDisplay: Remove logic in DefaultDisplaySpec

This includes changes required to allow oz-wl to build with compilers that
support the `override' keyword, as well as a build fix for Tizen IVI/Generic
due to sign warnings turned errors.
Merge pull request #1779 from rakuco/oz-wl-roll

DEPS.xwalk: Roll ozone-wayland (39d93a6 -> a4e3e96).
DEPS.xwalk: Roll chromium-crosswalk (ddec722 -> b83e11e).

b83e11e Merge pull request #141 from rakuco/oz-wl-patch
1e69b19 [Temp] Add support to provide external ozone files in views.
340e823 Merge pull request #139 from nagineni/resource_aware
5d93013 [TIZEN] Tag the audio stream as "browser" in pulseaudio.
Merge pull request #1778 from rakuco/cr-roll

DEPS.xwalk: Roll chromium-crosswalk (ddec722 -> b83e11e).
packaging: Remove ash flags from compilation

There shouldn't be any difference in the binary though, case xwalk is not
pulling any Ash dependencies.
Merge pull request #1782 from tiagovignatti/for-upstream

packaging: Remove ash flags from compilation
[Tizen][Runtime] Add tizen application handler.

Add a handler for tizen application element, so that we
can get and validate tizen application info from tizen
particularly widget package.

Feature=https://crosswalk-project.org/jira/browse/XWALK-1161
FeatureID: 0200, 0210
[Runtime] Fix using uninitialized variable "is_valid_" for WGT package
extracting.

The uninitialized variable "is_valid_" in package.cc(h) may lead to
error when installing a WGT package, and it should be initialized before
using it in Extract method.
[SysApps][Tizen] Refine display attributes based on latest spec

SPEC=http://www.w3.org/2012/sysapps/device-capabilities/
BUG=XWALK-1349
Merge pull request #1783 from qjia7/master

[SysApps][Tizen] Refine display attributes based on latest spec
Merge pull request #1777 from yeyuyinjie/master

[Tizen][Runtime] Add tizen application handler.
Merge pull request #1756 from takethathe/fix_package_extract

[Runtime] Fix using uninitialized variable "is_valid_" for WGT package extracting.
Merge pull request #1768 from takethathe/navigation_link

[Tizen][Runtime] Enable "allow-navigation" feature for Tizen legacy WGT package.
[Extensions] Add command line switch xwalk-extension-cmd-prefix

This will prepend the contents of this flag to the command line
when starting extension process, it works as same as the switch
"--renderer-cmd-prefix", could be useful if we need to debug
the extension process at its very beginning.
Useful values might be "valgrind" or "xterm -e gdb --args".

Also modified the child path flag which is used to retrieve the
child process' execution file according to the extension command
line prefix on linux. In most cases we need to use CHILD_ALLOW_SELF
to exec child process from /proc/self/exe to prevent chromium's
autoupdate feature to change the file out from underneath; For the
case of xwalk-extension-cmd-prefix, as we suppose to override the
command line to load the app directly, we need to use CHILD_NORMAL
to exec child process from its real app path.