https://bugs.webkit.org/show_bug.cgi?id=99780

Reviewed by Adam Barth.

Source/WebCore:

Chrome Apps do not support the history API (or navigation in general).
Since pushState is generally feature detected, it's cleanest to disable
it via a V8 per-context feature, so that applications can have the
appropriate fallback behavior (other history APIs are re-mapped to throw
exceptions, since history.back() and the link are not feature detected).

* dom/ContextFeatures.cpp:
(WebCore::ContextFeatures::pushStateEnabled):
(WebCore):
* dom/ContextFeatures.h:
* dom/Document.cpp:
(WebCore::Document::enqueuePopstateEvent):
* page/History.idl:

Source/WebKit/chromium:

Add pushState context feature.

* public/WebPermissionClient.h:
(WebPermissionClient):
(WebKit::WebPermissionClient::allowPushState):
* src/ContextFeaturesClientImpl.cpp:
(WebKit::ContextFeaturesClientImpl::askIfIsEnabled):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@132421 268f45cc-cd09-0410-ab3c-d52691b4dbfc