Bug 975741: Store the initial value of 'perspective' as 'none' rather than the (invalid value) '0' to make storage of 'none' consistent, and remove workaround from nsComputedDOMStyle computed value implementation. r=heycam

layout/style/nsComputedDOMStyle.cpp

@@ -1233,12 +1233,7 @@ CSSValue*
 nsComputedDOMStyle::DoGetPerspective()
 {
     nsROCSSPrimitiveValue* val = new nsROCSSPrimitiveValue;
-    if (StyleDisplay()->mChildPerspective.GetUnit() == eStyleUnit_Coord &&
-        StyleDisplay()->mChildPerspective.GetCoordValue() == 0.0) {
-        val->SetIdent(eCSSKeyword_none);
-    } else {
-        SetValueToCoord(val, StyleDisplay()->mChildPerspective, false);
-    }
+    SetValueToCoord(val, StyleDisplay()->mChildPerspective, false);
     return val;
 }
 

layout/style/nsRuleNode.cpp

@@ -5589,7 +5589,7 @@ nsRuleNode::ComputeDisplayData(void* aStartStruct,
 
   SetCoord(*aRuleData->ValueForPerspective(), 
            display->mChildPerspective, parentDisplay->mChildPerspective,
-           SETCOORD_LAH | SETCOORD_INITIAL_ZERO | SETCOORD_NONE |
+           SETCOORD_LAH | SETCOORD_INITIAL_NONE | SETCOORD_NONE |
              SETCOORD_UNSET_INITIAL,
            aContext, mPresContext, canStoreInRuleTree);
 

layout/style/nsStyleStruct.cpp

@@ -2289,7 +2289,7 @@ nsStyleDisplay::nsStyleDisplay()
   mTransformOrigin[2].SetCoordValue(0);
   mPerspectiveOrigin[0].SetPercentValue(0.5f);
   mPerspectiveOrigin[1].SetPercentValue(0.5f);
-  mChildPerspective.SetCoordValue(0);
+  mChildPerspective.SetNoneValue();
   mBackfaceVisibility = NS_STYLE_BACKFACE_VISIBILITY_VISIBLE;
   mTransformStyle = NS_STYLE_TRANSFORM_STYLE_FLAT;
   mOrient = NS_STYLE_ORIENT_AUTO;

layout/style/test/property_database.js

@@ -1732,7 +1732,7 @@ var gCSSProperties = {
 		type: CSS_TYPE_LONGHAND,
 		initial_values: [ "none" ],
 		other_values: [ "1000px", "500.2px" ],
-		invalid_values: [ "pants", "200", "0", "-100px", "-27.2em" ]
+		invalid_values: [ "pants", "200", "0", "-100px", "-27.2em", "0px" ]
 	},
 	"backface-visibility": {
 		domProp: "backfaceVisibility",