Add xwalk path to git ignore list
Also need to set aura::Window title

Since each DesktopNativeWidgetAura uses a sole aura::Window as its
backed, once the title of native widget gets updated, the title of
aura::Window should also be updated in addition to updating the
XWindow created by DesktopRootWindowHostX11.

BUG=https://github.com/otcshare/crosswalk/issues/191
TEST=xwalk_browsertest --gtest_filter=XWalkRuntimeTest.GetWindowTitle

Conflicts:
	ui/views/widget/desktop_aura/desktop_native_widget_aura.cc

Rework with 32.0.1700.4 by Halton
Aura: fix the touch event doesn't work on Tizen 3.0 issue.

Chromium uses the sourceid of a XIDeviceEvent to decide if it is orignated
from a touch device. See events_x.cc:717. However, Chromium uses deviceid to
check touch device. See touch_factory_x11.cc:158.

As X11 spec, only slave device has same sourceid and device id. So Chromium
should setup touch device list with XISlavePointer other than XIMasterPointer
device.

BUG=https://github.com/otcshare/crosswalk/issues/187
TESTS=https://github.com/borismus/MagicTouch/blob/master/samples/tracker.html

Rework with 32.0.1700.4 by Halton
Export DesktopCursorLoaderUpdaterAuraX11 and DesktopFocusRules to maintain DesktopRootWindowHost inside xwalk.

We will perhaps make something like ui/views/widget/desktop_aura inside xwalk to
satisfy our all requirements. At that time, this patch can be rollbacked.

Rework with 32.0.1700.4 by Halton
Fix touch support issue on Tizen 2.1

On Tizen 2.1, the multi-touch support is different from the XInput2.2
approach. It extends the older Input2.1 spec to use multiple touch
devices for multiple touch points, one touch device for one touch
points. The device type name for this purpose is MULTITOUCHSCREEN which
is not defined by XInput extension.

This fix is to make Crosswalk be able to handle the new extension to
XInput2.1 by introducing a new build option 'enable_xi21_mt'. It should
be turned on for Tizen 2.1, and is exclusive to 'use_xi2_mt' option.

Rework with 32.0.1700.4 by Halton
Move ENABLE_XI21_MT definition to xwalk.

We don't want to change chromium sources if possible.

Conflicts:
	build/common.gypi

Rework with 32.0.1700.4 by Halton