[Tizen][Performance] Enable Accelerated 2D Canvas.

If GPU context can be lost, Accelerated 2D Canvas is disabled, because there is
no way to recover Accelerated 2D Canvas when GPU crashes. However, interestingly,
Android and ChromeOS mark it false to take advantage of Accelerated 2D Canvas
without fallback solution. They just take a risk.

So gfx::GLSurfaceEGL::IsCreateContextRobustnessSupported() decides whether to
enable A2DC. Currently, IVB supports context robustness, but ATOM might not
support it. Tizen takes a risk like Android and ChromeOS.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1452
Merge pull request #1968 from ds-hwang/a2dc

[Tizen][Performance] Enable Accelerated 2D Canvas.
Bump version to 7.35.140.0
[Runtime] Fix can not ignore preference items when prase.

According to
http://www.w3.org/TR/widgets/#the-name-attribute-1
an preference item should have name attr, or it should be
ignored, and it there are two or more preferences used same
name, the first one should be took when others shoud be
ignored.