Merge pull request #974 from cmarcelo/fix-test-for-load-on-demand

[Extensions] Fix a test to also pass with load on demand
[Extensions] Flip flag to enable loading extensions on demand

Now that it works, we can flip the flag to be enabled by default.
[Extensions] Convert 'entry_points' to be a vector of strings.

With this, we avoid potencial confusions and problems that could
arise about who owns the entry_points of an extension.
Merge pull request #976 from vcgomes/flip-load-on-demand-flag

[Extensions] Flip flag to enable loading extensions on demand
Bump version to 2.31.24.0
Merge branch 'master' of github.com-crosswalk:crosswalk-project/crosswalk
[Android] Adjust the parameters for extension's two methods for reflection.

The onMessage and onSyncMessage are changed due to the support for multiple
instances for extension mechanism. However, the Java extension mechanism
doesn't change its parameters when looking up the methods for external
extensions. The unit test for external extensions will be added soon.

BUG=
[Extension] Fix build failure on Windows

Use '\' for the product_dir on Windows in external_extension_sample.gyp.
Otherwise, the build system can't handle the path well in some cases,
e.g. creating or deleting them.
It fails the windows build when it starts from zero.
Merge pull request #969 from wang16/fix_windows

[Extension] Fix build failure on Windows
Merge pull request #978 from yongsheng/multiinstance

[Android] Adjust the parameters for extension's two methods for reflecti...
[Android] Add the interface of loadAssetFile and onTitleChanged.

Add the interfaces in embedded and shared mode.
loadAssetFile: It is needed when we put the test files(eg. html) under
the test assets.
onTitleChanged: Implement a callback function in the test client,
transfer it to XWalkCoreProvider, then set it to the XWalkWebChromeClient,
In the XWalkWebChromeClient,'s callback, invoke the callback functions
which we defined, notify the test client about the title changed.
Move most of the util codes to a utility folder for reuse.
[Android] Add the dependency about test apk.

On the buildbot, we need to generate the
XWalkRuntimeClientEmbeddedTest.apk and XWalkRuntimeClientTest.apk
before the instrumentation test.
Merge pull request #970 from wuhengzhi/runtime_client

[Android] Add the interface of loadAssetFile and onTitleChanged.
Merge pull request #985 from wuhengzhi/xwalk

[Android] Add the dependency about test apk.
[Windows] Enable aura on Windows

The origin MACRO protection for XWalkViewsDelegate
is "#if !defined(OS_WIN) && defined(USE_AURA)", which
is not appropriate on Windows after Windows build also
switches to use aura.

Change the condition to "#if defined(USE_AURA)" and
implement the missing abstract function on Windows.
[Android] Add Java extension system files to xwalk core library project.

As extensions are required by apps that developed based on xwalk core
library, the files of Java extension system should be added to the tree
of xwalk core library project.
[Android] Disabled two test cases about ExtensionBroadcast and ExtensionEchoMultiFrames.

Due to these two test cases failed on buildbot, disabled them temporally.
They will be enabled later.
Merge pull request #989 from wuhengzhi/runtime_client

[Android] Disabled two test cases about ExtensionBroadcast and Extension...
Bump version to 2.31.25.0
Merge pull request #987 from wang16/windows_aura

[Windows] Enable aura on Windows