Hi,

Description:

The Dual process model is a process model where each application run contains 
two processes:
The first process includes Browser process (BP),  GPU process (GP) and 
Extension process (EP)
The second process is Renderer process (RP) and it runs in Seccomp sandbox

Rational:

At the moment Crosswalk on Tizen is using Shared process model (sharing BP 
between all the apps) this however creates the following problems:

(1) the diversity from Crosswalk implementations on other platforms 
(2) great complexity (BP has to do a lot of extra stuff to handle multiple apps 
+ we've a dbus launcher) and hence 
(3) more bugs (because of more complexity). 

All these significantly increase the development and maintenance costs (the 
recent efforts on enabling of Tizen platform security mechanisms in Crosswalk 
is a good example of how having the Shared process model caused a lot of 
troubles)

Affected components:
Crosswalk on Tizen, Crosswalk application tools (xwalk launcher, xwalkctl)

This change will apparently modify also the Tizen Crosswalk command line 
interface  (for example remote debugging cmd line options) whereas xwalk binary 
will be invoked directly.

Target platform: Tizen

Implementation plan:
1) Add the Tizen appcore-related logic and other functionality from 
xwalk-launcher to BP
2) Make the necessary modifications in Tizen so that it does not rely on the 
Shared process model any more (e.g. launches xwalk instead of xwalk-launcher)
3) Merge EP and GP into BP -- make it Dual process model
4) Clean up tons of unused code, including removal of xwalk-launcher (yay!)

BR,
Mikhail
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