[Tizen] Move platform sensor initialization out from browser UI thread.

Cold start time of sample Calulator application increases to ~1080 ms on
Tizen VTC-1010 at the moment. One bottleneck is it takes long period to
initalize platform sensors inside browser main thread, which blocks native
window display and starting render message loop.

The CL moves the platform sensors initialization outside of browser main
thread. The local test result shows it shortens ~200ms of cold start
time.

BUG=XWALK-2520
[Tizen] Fix xwalkctl crash during application uninstallation

Fix xwalkctl crash when uninstallation process is interrupted and run again.
Method PackageInstaller::PlatformUninstall argument is modified.
Instance of ApplicationData is not necessary for the method,
application id value is enough.

BUG=XWALK-2686
Merge pull request #2493 from sstolinski/sstolinski

[Tizen] Fix xwalkctl crash during application uninstallation
Bump version to 10.38.223.0
[Tizen] New discovery page for devtools.

Add chrome style decorates to discovery page of devtools to improve user experience.

BUG=https://crosswalk-project.org/jira/browse/XWALK-2525
[Tizen] No need to show crosswalk icon
The icon of crosswalk is shown on ivi-ux-ico which is not correct.
This fix modifies the crosswalk config file to not show its icon by default.

BUT=TC-1708
Merge pull request #2497 from yejingfu/bug-fix

[Tizen] No need to show crosswalk icon on ivi-ux-ico
[Android] Replace external extensions with source instead of jar

The prebuild jar files of external extensions may out of date as
the runtime is walking forward. So place them with source code.

BUG=https://crosswalk-project.org/jira/browse/XWALK-2539
Merge pull request #2409 from iKevinHan/new-devtools-page

[Tizen] New discovery page for devtools
Merge pull request #2460 from shaochangbin/sensor-launch-time

[Tizen] Move platform sensor initialization out from browser UI thread.
[Tizen] Fix secure-storage dependency

BUG=XWALK-2707
Merge pull request #2469 from DonnaWuDongxia/replaces-jars-gypi

[Android] Replace external extensions with source instead of jar
Merge pull request #2500 from jizydorczyk/fix-encryption-dependency

[Tizen] Fix secure-storage dependency
M39 Gardening : Roll out 39.0.2166.2
M39 Gardening : Remove special checkout for WebRTC

M39 already contains a version ahead of what's needed.
M39 Gardening : Fix xwalk.gyp due to upstream changes.
M39 Gardening : roll out new v8 history.

A SIMD patch was left over, to build it needs all the pieces. SIMD
is skipped for now.
M39 Gardening : Roll out new Chromium including Mac build fix.
Gardening M39 : First round of buildfixes.

- Use get() when using smart pointers.
- Adapt to API changes.
- Disable simd for now.
Gardening M39 : Roll out 39.0.2171.2