Implementation of CSS3 nav-up/down/left/right properties from CSS3 UI.

LayoutTests/fast/spatial-navigation/snav-css-nav-direction-expected.txt

Index: LayoutTests/fast/spatial-navigation/snav-css-nav-direction-expected.txt
diff --git a/LayoutTests/fast/spatial-navigation/snav-css-nav-direction-expected.txt b/LayoutTests/fast/spatial-navigation/snav-css-nav-direction-expected.txt
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+This test ensures the correctness of Spatial Navigation (SNav) when CSS3 nav-up/down/left/right properties are set.
+* Pre-conditions:
+1) DRT support for SNav enable/disable.
+* Navigation steps:
+1) Loads this page, focus goes to start position (element #e5) automatically.
+2) Focus moves away from start postion in various direction, CSS nav-* attributes are expected to be respected.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+1       2       3
+4       5       6
+7       8       9
+PASS gFocusedDocument.activeElement.getAttribute("id") is "e9"
+PASS gFocusedDocument.activeElement.getAttribute("id") is "e9"
+PASS gFocusedDocument.activeElement.getAttribute("id") is "e5"
+PASS gFocusedDocument.activeElement.getAttribute("id") is "e2"
+PASS gFocusedDocument.activeElement.getAttribute("id") is "e4"
+PASS gFocusedDocument.activeElement.getAttribute("id") is "e6"
+PASS gFocusedDocument.activeElement.getAttribute("id") is "e8"
+PASS gFocusedDocument.activeElement.getAttribute("id") is "e5"
+