[Runtime] Add GetApplicationByID in ApplicationService

Using GetApplicationByID replace with the GetApplicationStore, since it's very
dangrous to export the ApplicationStore outside ApplicationService.
[Runtime] Add switch "--list-apps" to list all installed applications from command line

Execute the xwalk with "--list-apps" switch will print all installed applications
information to standared IO stream.
Merge pull request #900 from takethathe/list

[Runtime] List all installed applications from command line
[Packaging] Remove version numbers from the RPM patches.

Those numbers were not serving for any purpose: they were initially intended
for a workflow that involved `gbs import` and `gbs export`, which would then
update the numbers and drop patches automatically.

Since we are not using those tools at all, just removing the numbers makes
more sense.
Merge pull request #919 from rakuco/remove-versions-from-patches

[Packaging] Remove version numbers from the RPM patches.
Bump version to 2.31.20.0
Bump chromium-crosswalk in DEPS.xwalk.

Bring in the fix in chromium to fix the rendering issue
of content shell when using single process on Android.
Merge pull request #923 from wang16/roll_deps

Bump chromium-crosswalk in DEPS.xwalk.
[Android] Refine the xwalk_core_test_apk target

This fix is to refine the test target to make it more cleaner to add
HTML testing file as apk asset file. Right now, when adding a new HTML
file for testing, you just need to update the 'sources' list without
adding a new entry item in 'copies' list.
Merge pull request #612 from seanlong/xiang_api

[Runtime] Add application extension skeleton and getManifest, getMainDocument API support
[Extensions] Refactoring XWalkExtensionService::RegisterExtension

Nowadays our XWalkExtensionService is only capable of handling
one RenderProcess. Thus, it only has one in_process XWalkExtensionServer
for handling internal extensions. Soon enough this will considerably
change and we will have to be capable of handling one in_process
XWalkExtensionServer per RenderProcess.

This patch is the first step towards this: internal extensions
will be created directly by the XWalkExtensionService::Delegate
"on-demand" every time a new in_process XWalkExtensionServer
is created for a new RenderProcess and it is time to register
the internal extensions on it.

The entity implementing XWalkExtensionService::Delegate is
XWalkBrowserMainParts. This way we keep the old behavior and design
not polluting XWalkExtensionService.

Necessary adjustments were made to RegisterExtensionsCallback and
browser_tests for the same reason.
Enable multithreaded GPU compositing of web content by default.

Enable multithreaded GPU compositing of web content by default, this also enables pinch gesture support on Tizen.
Merge pull request #933 from pozdnyakov/EnableThreadedCompositing

Enable multithreaded GPU compositing of web content by default.
[Extensions] Remove unused function
[Extensions][Android] Make CreateExtension call XWalkExtensionService directly

XWalkBrowserMainParts is now a XWalkExtensionService::Delegate, meaning that
XWalkExtensionService will call RegisterInternalExtensionsInServer everytime
a new in_process XWalkExtensionServer is created (for a new RenderProcess).

Therefore, XWalkExtensionService::RegisterExtension() has been removed
and XWalkExtensionAndroid will now need to register its extensions on
XWalkBrowserMainParts so them can get correctly registered on-demand
by XWalkExtensionService.
Merge pull request #934 from cmarcelo/remove-dead-code

[Extensions] Remove unused function
[Extensions] Use a vector instead of a map for extension modules

In XWalkModuleSystem, use a vector instead of a map for extension
modules. The number of modules is small and we'll benefit from being
able to easily get sorted iteration later to identify the extension
modules that can be loaded on demand.
Merge pull request #910 from jeez/refactor-register-extension

[Extensions] Refactoring XWalkExtensionService::RegisterExtension
Merge pull request #937 from cmarcelo/extension-modules-vector

[Extensions] Use a vector instead of a map for extension modules
Bump version to 2.31.21.0