Add a test that rects with fixed-size SVGs don't get invalidated on resize of container.

third_party/WebKit/LayoutTests/paint/invalidation/svg/resize-svg-invalidate-children-fixed-size-relative-child.html

Index: third_party/WebKit/LayoutTests/paint/invalidation/svg/resize-svg-invalidate-children-fixed-size-relative-child.html
diff --git a/third_party/WebKit/LayoutTests/paint/invalidation/svg/resize-svg-invalidate-children.html b/third_party/WebKit/LayoutTests/paint/invalidation/svg/resize-svg-invalidate-children-fixed-size-relative-child.html
similarity index 51%
copy from third_party/WebKit/LayoutTests/paint/invalidation/svg/resize-svg-invalidate-children.html
copy to third_party/WebKit/LayoutTests/paint/invalidation/svg/resize-svg-invalidate-children-fixed-size-relative-child.html
index c35a512bec2ea33cbf04143cc0e34d92c0d3a421..0cefc399c88f5c6c9056ddc5c84c83dcf8d56c01 100644
--- a/third_party/WebKit/LayoutTests/paint/invalidation/svg/resize-svg-invalidate-children.html
+++ b/third_party/WebKit/LayoutTests/paint/invalidation/svg/resize-svg-invalidate-children-fixed-size-relative-child.html
@@ -3,19 +3,19 @@
 <script src="../../../resources/testharnessreport.js"></script>
 <script src="../resources/text-based-repaint.js"></script>
 <script>
-// When resizing the div that contains SVG, the SVG root element and rect resize accordingly.
-// It's necessary to invalidate the rect in this case.
-window.expectedObjectInvalidations.push("LayoutSVGRect rect");
+// Since the SVG root element has fixed size, we should not need to
+// invalidate the rect within it.
+window.expectedObjectNonInvalidations.push("LayoutSVGRect rect");
 
 onload = runRepaintTest;
 window.outputRepaintRects = false;
 function repaintTest() {
-	target.style.width = '200px';
-	target.style.height= '200px';
+    target.style.width = '200px';
+    target.style.height= '200px';
 };
 </script>
 <div id="target" style="width: 100px; height: 100px"> 
-    <svg viewBox="0 0 200 200">
-        <rect x="50" y="50" width="100" height="100"/>
+    <svg viewBox="0 0 200 200" width="100" height="100">
+        <rect width="100%" height="100%"/>
     </svg>
 </div>