Merge 93296 - Prepare frames for history navigation.

Merge 93296 - Prepare frames for history navigation.

Before beginning an explicit history navigation in a newly initialized
frame, it's important to give a "previous" item to avoid crashes, and
give a state to the state machine to avoid extra validating loads.

https://bugs.webkit.org/show_bug.cgi?id=66322

Reviewed by Darin Fisher.

Source/WebCore:

No new tests, as history navigation is very difficult to test in
DumpRenderTree.

* loader/FrameLoader.cpp:
(WebCore::FrameLoader::prepareForHistoryNavigation):
* loader/FrameLoader.h:

Source/WebKit/chromium:

* src/WebFrameImpl.cpp:
(WebKit::WebFrameImpl::loadHistoryItem):


TBR=gavinp@chromium.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=93533

[gavinp, 2011-08-23 15:52:43]

LGTM