[Linux] Add NaCl support

Based on NaCl component work (http://crbug.com/244791) from upstream,
this commit is to add Native Client(aka NaCl) support.
It now can run examples from nacl sdk.
  $ cd <nacl_sdk_dir>/pepper_canary/example
  $ TOOLCHAIN=newlib make serve
  $ xwalk http://localhost:5103

BUG=XWALK-1338
[Android] Use intent actions to handle navigation according to MIME type.

Currently only "application/*" MIME type are handled by intent actions,
for other MIME types (text/*, video/*...) are still handled by XWalk.

BUG=XWALK-1560
[Android] Refine the callback function of compressor.

This patch is to refine the feature of compressor.
optparse stores the converted value when we use '--compressor'
at the first time. Then we use '--compressor=css', optparse
does not consume the argument.
Add 'type' and 'nargs', they instruct optparse to consume the
argument and convert the parameter to related type.
Add test case for this feature.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1151
[Android] Add the test case for evaluateJavascript.

This patch is to add the test case for evaluateJavascript.
Open a html file, set the title by evaluateJavascript, verify the
title with expected title.
[Android] Add the test case for addJavascriptInterface.

In this test case, we should use "@JavascriptInterface", it's from
"org.xwalk.core.JavascriptInterface", not
"android.webkit.JavascriptInterface".
In addition, if the target sdk version will be equal to or greater
than 17, "@JvascriptInterface" is required.

BUG=XWALK-1595
[Android] Fix the potential memory issue in XWalkPreferences

* Use WeakReference instead to make sure the key listener can be GC-ed
* Add unload internal method to remove the listener from the global list

BUG=https://crosswalk-project.org/jira/browse/XWALK-1613
[Application] Fix debug mode issues for extension process running in launcher

There are several DCHECK issues:
1. DBus FileDescriptor validity check should runs on IO allowed thread;
2. AtExitManager should be created for registering dtor callbacks;
3. XWalkExtensionProcess should be destroyed on its own thread.
Merge pull request #1895 from seanlong/ep_launcher_fix

[Application] Fix debug mode issues for extension process running in launcher
Revert "[Runtime Model] Packaging the XPK package generator in Linux & Windows"

We've never officially shipped any Windows or Linux archives, so this
target is not really serving any purpose.

This reverts commit 0b649e3b21882fe3b61afa8a4f46e6f54f51f144.
Bump version to 6.35.133.0
Merge pull request #1695 from wuhengzhi/refine_compressor

[Android] Refine the callback function of compressor.
[Android] Specify valid characters and verify app name.

This patch is to specify valid characters and verify the app name
in customize.py
Specify the valid characters, if the app name or package name is invalid,
provide the error information and advice.
Add test cases for invalid chars.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1298
[Android] Format the description, add links and correct typos.

Continue to refine the description of embedding API:
1. Use '<p>' to format the description.
2. Add links to Android API doc.
3. Correct some typos.

BUG=XWALK-1620
[Tizen][Runtime] Fix allow-navigation can not take effect in cross
origin page.

allow-navigation setting should take effect in all web app pages, but in
current implementation, it's only enforced for app local pages. This
patch will expand the scope.
[Android] Show launch screen dialog when no 'image' provided

Previously, when there is no 'image' provided, the launch screen dialog will not be displayed.
It should be displayed, because the backgrounds need to be displayed until the ready_when state.

BUG=XWALK-1635
[Runtime] Enable cookie for app and devtool schemes

Enable the content SQLite based cookie storage.
All installed applications will share the same database file, but the
access will be restricted by their application ID.

BUG=XWALK-1587
Merge pull request #1898 from yongsheng/refinedoc

[Android] Format the description, add links and correct typos.
Merge pull request #1894 from hmin/xwalk-preferences

[Android] Fix the potential memory issue in XWalkPreferences
Merge pull request #1904 from takethathe/allow-navigation

[Tizen][Runtime] Fix allow-navigation can not take effect in cross origin page.
Merge pull request #1801 from halton/nacl

[Linux] Add NaCl support