[Runtime] Make application running with isolated storage partition

Tizen WRT spec and Chrome both require applications running with private
storage. Which means the application running data like local storage, cookies,
app cache, GPU cache will move to a standalone storage directory.

When an app is uninstalled, it is not safe to remove the corresponding
directory directly. So we will mark the uninstalled apps in DB and garbage
collect them when next time Crosswalk starts up.
[Android] Add test case for getCurrentItem().

Load a url, get the current item, compare its url and titel with the expected result.
[Android] Launch Screen test

The patch of Launch Screen auto test is missing.
Re submit the patch.

BUG=XWALK-1805
Bump version to 7.36.148.0
[Tools] Stop fetching build/scripts/tools/deps2git.

We do not need anything from build/ at all, and this one probably got in
when we moved across milestones.

While here, remove a duplicate entry for
build/third_party/cbuildbot_chromite.
Merge pull request #2025 from rakuco/stop-fetching-build-deps2git

[Tools] Stop fetching build/scripts/tools/deps2git.
Bump version to 7.36.149.0
[Android] Fix null callback issue in XWalkView.evaluateJavaScript.

In case that the callback is a `null` value, XWalkView should behave normally and
same as Android WebView.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1815
Merge pull request #2006 from seanlong/isolate_storage

[Runtime] Make application running with isolated storage partition
Merge pull request #2023 from jinbang/test_api_getCurrentItem

[Android] Add test case for getCurrentItem().
[Android][Script] Fixes in XWalk debugging script

The env variable CHROME_SRC is not exposed, use ENVSETUP_GYP_CHROME_SRC
instead
Native File System API

Completed features list:

Create file
Read file
Write file
Remove file
Create Directory
List Directory Entries
Remove Directory

BUG=https://crosswalk-project.org/jira/browse/XWALK-672

Support for Android is coming soon.
Merge pull request #1889 from shawngao5/native_file_system

Native File System API
[Tizen][Runtime] Fix lose symbolic link after update.

Before PR https://github.com/crosswalk-project/crosswalk/pull/1933
we update an application by uninstall and install.

And after this PR update have independent logic, so we will lose
symbolic link when update an application.
Merge pull request #2016 from kurli/launch-screen-test-case

[Android] Launch Screen test
Merge pull request #2029 from sqliu/fix-evaluate-js

[Android] Fix null callback issue in XWalkView.evaluateJavaScript.
Merge pull request #2028 from hmin/script

[Android][Script] Fixes in XWalk debugging script
Merge pull request #2032 from CooderIan/fix_symbolic_link

[Tizen][Runtime] Fix lose symbolic link after update.