[Tizen] Make better split between Tizen and Tizen mobile codebase

There are generic and mobile specific parts of the code that could
be split or shared. This patch enables -Dtizen=1 by default and moves
mobile specific code under tizen_mobile and OS_TIZEN_MOBILE flags.
[Android] Support package file name including space character.

If package file name includes space character, this character
will be replaced with '_', according to the new user requirement,
blank character should be supported, this fix resolves this issue
by removing the space from the invalid characters.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1006
[Android] Temporarily disable CSP support and related test.

A known issue was found in the common code of csp implementation
both for Android and Tizen, so disable the bridge code in android
until the issue was fixed.

bug=https://crosswalk-project.org/jira/browse/XWALK-1022
[Android] Fix the issue onPageFinished callback would be called twice

This commit contains the following changes:

o Only rely on didStopLoading to call onPageFinished callback. Generally, both
  didStopLoading and didFinishLoad callbacks are the same except
  1) didStopLoading will also be called for extended protocols, like mailto:,
     tel: etc;
  2) didStopLoading will be called if user clicks "X" button on the browser UI.

o Loading javascript: URL should not cause onPageFinished calling since it is
  assumed that javascript: url is executed in an existing JS context in a web
  page already loaded.

o Port some test cases from android_webview/ for onPageFinished test.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1017
TEST=org.xwalk.core.xwview.test.XWalkClientOnPageFinishedTest
Merge pull request #1605 from alexshalamov/split_mobile_and_generic_tizen

[Tizen] Make better split between Tizen and Tizen mobile codebase
Merge pull request #1619 from gaochun/csp2

[Android] Temporarily disable CSP support and related test.
Merge pull request #1610 from hmin/duplicated-onpagefinished

[Android] Fix the issue onPageFinished callback would be called twice
Merge pull request #1602 from ShDavidliu/UpdatePackageName

[Android] Support package file name including space character.
Override notification related interface from content

There are four methods in content browser client which are for
client to implement to support web notification.
Override those apis with empty function bodies first.
[Android] Implement W3C WebNotification API

W3C web notification API is defined at http://www.w3.org/TR/notifications/.
On Android, web notifications are well matched to system notifications.
To invoke js callbacks when system notification got clicked or canceled,
two pendingIntents are binded to the notification.
Since Android only keeps one pendingIntent for specified Context/Class/Category,
the unique id of the notification is used as the Category of the pendingIntents.

Platforms other than Android keeps empty implementaion for notification related
interfaces.

TEST=XWalkCoreTest org.xwalk.core.xwview.test.WebNotificationTest
BUG=https://crosswalk-project.org/jira/browse/XWALK-94