[M34-Merge]Add file:// protocol handler specific for WRT.

[M34-Merge]Add file:// protocol handler specific for WRT.

This patch is porting of following patches:
http://165.213.202.130:8080/#/c/70649/ by Zbigniew Kostrzewa
http://165.213.202.130:8080/#/c/70977/ by Marek Ruszczyński
http://165.213.202.130:8080/#/c/71786/ by Piotr Szawdyński
(second and third are fixups of the first)

Original commit message:

This commit extends file:// URI scheme to provide features
specific to WRT.
When Chromium launch originates from WRT then each reference
to a resource via file:// URI scheme results in an IPC message
sent from browser to renderer and back to give a chance to WRT
to modify the URI.

Bug: http://107.108.218.239/bugzilla/show_bug.cgi?id=10412
Bug: http://107.108.218.239/bugzilla/show_bug.cgi?id=10405
Reviewed by: Jaesik Chang, Piotr Tworek, SeungSeop Park

Change-Id: Id875fd7b03a231a098f8277c6af5f2031da03861
Signed-off-by: Wojciech Wiśniewski <w.wisniewski@samsung.com>