[Android] Add test cases for XWalkJavascriptResult.

This patch is to add test cases for the interfaces in
XWalkJavascriptResultInternal.java.
[Android] Embedding API 3.0: XWalkPreferences

Add following APIs:
public static final String JAVASCRIPT_CAN_OPEN_WINDOW;
public static final String ALLOW_UNIVERSAL_ACCESS_FROM_FILE;
public static final String SUPPORT_MULTIPLE_WINDOWS
public static void setValue(String key, String value);
public static void setValue(String key, int value);
public static boolean getBooleanValue(String key);
public static String getStringValue(String key);
public static int getIntegerValue(String key);

Deprecated API:
public static boolean getValue(String key);

BUG=https://crosswalk-project.org/jira/browse/XWALK-2376
[Runtime] Add "-c" option for xwalkctl for restarting aborted install/update tasks.

Crosswalk runtime should have a mechanism to restart the aborted install or
update tasks which are stopped by accident like power off. This patch related to
bug: https://crosswalk-project.org/jira/browse/XWALK-1565

How to use:
========
$ xwalkctl --continue
Merge pull request #2341 from wuhengzhi/xwalk_js_result_test

[Android] Add test cases for XWalkJavascriptResult.
Merge pull request #2375 from takethathe/restart_task

[Runtime] Add "-c" option for xwalkctl for restarting aborted install/update tasks
Multi user features :

->Use Usr App related fonctions instead of Global App related Functions
->Manage properly icon path for each user

BUG=XWALK-2249

Change-Id: I5be59d0264aed84f708273b58061c8834dd63404
Signed-off-by: Sabera Djelti (sdi2) <sabera.djelti@open.eurogiciel.org>
Signed-off-by: Baptiste DURAND <baptiste.durand@open.eurogiciel.org>
Merge pull request #2298 from eurogiciel-oss/multiuser_xwalk_2249

Multi user features :
Merge pull request #2354 from wang16/embedding_api_3

[Android] Embedding API 3.0: XWalkPreferences
[Android] Use reflection layer in xwalk core for runtime usage

As now there is reflection layer between xwalk core and xwalk
core internal, there is no need to use the one between runtime
and runtime client for runtime usage.

After this patch, most facilities to support shared mode will be
moved from runtime to xwalk core. Besides, runtime_java will be
merged into runtime_client_java.
XWalkRuntimeLib.apk will keep the name unchanged, but its package
will be org.xwalk.core which was org.xwalk.runtime.lib previously.

TODO: Extension is still using reflection in runtime layer which
will be refined in future commits.
[Android] Move extension manager out to runtime layer

Extension in runtime layer (XWalkExtensionClient) was
directly using XWalkExtensionAndroid, which has core
internal dependency.
It should be based on the extension provide by xwalk
core.
Move all the classes for runtime extension to runtime
client package and remove the reflection layer which
is not between XWalkExtension and XWalkExtensionInternal.