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Also added helper functions _CheckHistory and _NavigateAndCheckHistory used by the tests below to verify that the correct changes are made to the history list. 

Tests included: 
--------------- 
testNavigateBringPageToTop: 
--- Verify that navigation brings the current page to the top of the history list. 

testReloadBringPageToTop: 
--- Verify that reloading a page brings that page to the top of the history list. 

testBackForwardBringPageToTop: 
--- Verify that back/forward brings the current page to the top of the history list. 

testAppendTabAddPage: 
--- Verify that opening a new tab adds that page to the history list. 

testOpenWindowAddPage: 
--- Verify that opening a new window to a page adds that page to the history list. 

TEST=none 
BUG=none 

Continuation of CL 7544032.

Review URL: http://codereview.chromium.org/7574028

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95569 0039d316-1c4b-4281-b951-d872f2087c98