[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] 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.
[Android] Implement the feature of enabling immersive mode for full screen.

Since Android 4.4 (API Level 19) introduces the immersive related mode
for full screen, in Crosswalk, we need to support this feature accordingly.
This PR is resolving this issue by implementing the specific methods
corresponding to the scenarios that full screen mode is turned on and off.

BUG=https://crosswalk-project.org/jira/browse/XWALK-979