[Android] Embedding API version 3.0

New APIs in 3.0:
XWalkPreferences.JAVASCRIPT_CAN_OPEN_WINDOW;
XWalkPreferences.ALLOW_UNIVERSAL_ACCESS_FROM_FILE;
XWalkPreferences.SUPPORT_MULTIPLE_WINDOWS;
XWalkPreferences.PROFILE_NAME;
XWalkPreferences.setValue(String key, int value);
XWalkPreferences.setValue(String key, String value);
XWalkPreferences.getBooleanValue(String key);
XWalkPreferences.getIntegerValue(String key);
XWalkPreferences.getStringValue(String key);

Deprecated API in 3.0:
boolean XWalkPreferences.getValue(String key);
Merge pull request #2442 from wang16/embedding_api

[Android] Embedding API version 3.0