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In immersive fullscreen the "top container" holding the tabstrip and toolbar can slide down over the web content. Instant extended shows suggestions in an overlay web view, this must be adjusted to match the omnibox position when the top container is revealed. Instant extended also shows a suggestion+result page in the active web view, which must also be adjusted to align with the omnibox.

BUG=169414
TEST=Added to interactive_ui_tests BrowserViewTest and also manual.
On Chrome OS, enable the flags for instant extended and immersive fullscreen. Open a normal tab and one to the NTP. Test omnibox suggestions in both tabs, ensure they align with the omnibox. Hit F4 to go into fullscreen, do the same tests. Select "Show Bookmark Bar" and repeat both sets of tests.
TBR=sreeram@chromium.org for instant_extended.html changes

Review URL: https://codereview.chromium.org/13684002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194694 0039d316-1c4b-4281-b951-d872f2087c98