Delay the Wayland initialization in the WebProcess for WRT.

Delay the Wayland initialization in the WebProcess for WRT.

Wayland initialization should be done in the UIProcess before the WebProcess
starts to do this, but in case of WRT, the WebProcess does this ahead of the UIProcess.
So, we have to initialize the PlatformSurfacePoolTizen in WebProcess::createWebPage,
not WebProcess::initialize because it is triggered by the createWebPage message sent
from the UIProcess, which delays the Wayland initialization in the WebProcess.

This patch fixes the bug below:
WebGL context creation hangs when called from a web app
https://bugs.tizen.org/jira/browse/TIVI-1602

Change-Id: I8c886e9693ec2b398db0700e8de48401999ced52