Implement canvas2d direction attribute

LayoutTests/fast/canvas/canvas-direction-expected.txt

Index: LayoutTests/fast/canvas/canvas-direction-expected.txt
diff --git a/LayoutTests/fast/canvas/canvas-direction-expected.txt b/LayoutTests/fast/canvas/canvas-direction-expected.txt
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+Tests that canvas 2d context supports 'direction' attribute: PASS
+Tests that context.direction is 'ltr' with parent element having unspecified direction: PASS
+Tests that context.direction is 'rtl' with parent element having direction as rtl: PASS
+Tests that context.direction is overridden by 'rtl' with parent element having unspecified direction: PASS
+Tests that context.direction is overridden by 'ltr' with parent element having direction as rtl: PASS
+Tests that context.direction is overridden by 'inherit' with parent element having unspecified direction: PASS
+Tests that context.direction is overridden by 'inherit' with parent element having direction as rtl: PASS
+Tests that change in element's dir attribute is reflected in context.direction as rtl: PASS
+Tests that change in element's dir attribute is reflected in context.direction as ltr: PASS
+Tests that context.direction reflects the valid direction after save/restore context operations: PASS
+Tests that context.reset() sets the context.direction to ltr: PASS
+Tests that context.reset() sets the context.direction to rtl: PASS
+Tests that invalid direction value RTL has no effect on the context.direction: PASS
+Tests that invalid direction value LTR has no effect on the context.direction: PASS
+Tests that invalid direction value INHERIT has no effect on the context.direction: PASS
+