Add root margin support for IntersectionObserver.

third_party/WebKit/LayoutTests/intersection-observer/root-margin.html

Index: third_party/WebKit/LayoutTests/intersection-observer/root-margin.html
diff --git a/third_party/WebKit/LayoutTests/intersection-observer/iframe-root.html b/third_party/WebKit/LayoutTests/intersection-observer/root-margin.html
similarity index 50%
copy from third_party/WebKit/LayoutTests/intersection-observer/iframe-root.html
copy to third_party/WebKit/LayoutTests/intersection-observer/root-margin.html
index de889a579138f68b06f8320d65c54898a74841e7..2373843e7994164e8ec5a7f868d08398596f862c 100644
--- a/third_party/WebKit/LayoutTests/intersection-observer/iframe-root.html
+++ b/third_party/WebKit/LayoutTests/intersection-observer/root-margin.html
@@ -2,106 +2,98 @@
 <script src="../resources/js-test.js"></script>
 <script src="helper-functions.js"></script>
 <div style="width:100%; height:700px;"></div>
-<div id="root" style="display: inline-block; overflow-y: scroll; height: 200px;">
-  <div id="target" style="width:100px; height:300px"></div>
-  <iframe id="target-iframe" src="../resources/intersection-observer-subframe.html" style="width: 300px; height: 100px; overflow-y: scroll"></iframe>
+<div style="white-space: nowrap;">
+  <div style="display: inline-block; width: 1000px; height: 100px"></div>
+  <div id="target" style="display: inline-block; background-color: green; width:100px; height:100px"></div>
+  <div style="display: inline-block; width: 1000px; height: 100px"></div>
 </div>
 <div style="width:100%; height:700px;"></div>
 
 <script>
-description("Simple intersection observer test with no explicit root and target in an iframe.");
-var entries = [];
-var root = document.getElementById("root");
-var targetIframe = document.getElementById("target-iframe");
+  description("Intersection observer test with root margin and implicit root.");
+  var target = document.getElementById("target");
+  var entries = [];
 
-targetIframe.onload = function() {
-  var target = targetIframe.contentDocument.getElementById("target");
-  var iframeScroller = targetIframe.contentDocument.scrollingElement;
-
-  observer_callback = function(changes) {
+  function observer_callback(changes) {
     for (var i in changes)
       entries.push(changes[i]);
-  };
-  var observer = new IntersectionObserver(observer_callback, {"root": document.getElementById("root")});
+  }
+
+  var observer = new IntersectionObserver(observer_callback, {
+    rootMargin: "10px 20% 40% 30px"
+  });
   observer.observe(target);
 
   // TODO(szager): It shouldn't be necessary to RAF after the call to observer()
   // and before changing the scroll position, but it is.
 
+  setTimeout(function() {
+    shouldThrow("new IntersectionObserver(observer_callback, { rootMargin: '1' })");
+    shouldThrow("new IntersectionObserver(observer_callback, { rootMargin: '1em' })");
+    shouldThrow("new IntersectionObserver(observer_callback, { rootMargin: 'auto' })");
+    shouldNotThrow("new IntersectionObserver(observer_callback, { rootMargin: '1.4px' })");
+    shouldNotThrow("new IntersectionObserver(observer_callback, { rootMargin: '1.4px 2px' })");
+    shouldNotThrow("new IntersectionObserver(observer_callback, { rootMargin: '1.4px 2px 3%' })");
+    shouldNotThrow("new IntersectionObserver(observer_callback, { rootMargin: '1.4px 2px 3% 40px junk junk junk' })");
+    requestAnimationFrame(step0);
+  }, 0);
+
   function step0() {
     setTimeout(function() {
       shouldBeEqualToNumber("entries.length", 0);
-      document.scrollingElement.scrollTop = 250;
+      document.scrollingElement.scrollLeft = 100;
       requestAnimationFrame(step1);
     });
   }
 
   function step1() {
     setTimeout(function() {
-      shouldBeEqualToNumber("entries.length", 0);
-      iframeScroller.scrollTop = 200;
+      shouldBeEqualToNumber("entries.length", 1);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.left", 912);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.right", 1012);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.top", 708);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 808);
+      shouldBeEqualToNumber("entries[0].intersectionRect.left", 912);
+      shouldBeEqualToNumber("entries[0].intersectionRect.right", 942);
+      shouldBeEqualToNumber("entries[0].intersectionRect.top", 708);
+      shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 808);
+      shouldBeEqualToNumber("entries[0].rootBounds.left", -30);
+      shouldBeEqualToNumber("entries[0].rootBounds.right", 942);
+      shouldBeEqualToNumber("entries[0].rootBounds.top", -10);
+      shouldBeEqualToNumber("entries[0].rootBounds.bottom", 819);
+      shouldEvaluateToSameObject("entries[0].target", target);
+      document.scrollingElement.scrollTop = 800;
       requestAnimationFrame(step2);
     });
   }
 
   function step2() {
     setTimeout(function() {
-      shouldBeEqualToNumber("entries.length", 0);
-      root.scrollTop = 175;
+      shouldBeEqualToNumber("entries.length", 1);
+      document.scrollingElement.scrollTop = 900;
       requestAnimationFrame(step3);
     });
   }
 
   function step3() {
     setTimeout(function() {
-      shouldBeEqualToNumber("entries.length", 1);
-      shouldBeEqualToNumber("entries[0].boundingClientRect.left", 18);
-      shouldBeEqualToNumber("entries[0].boundingClientRect.right", 118);
-      shouldBeEqualToNumber("entries[0].boundingClientRect.top", 593);
-      shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 693);
-      shouldBeEqualToNumber("entries[0].intersectionRect.left", 18);
-      shouldBeEqualToNumber("entries[0].intersectionRect.right", 118);
-      shouldBeEqualToNumber("entries[0].intersectionRect.top", 593);
-      shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 658);
-      shouldBeEqualToNumber("entries[0].rootBounds.left", 8);
-      shouldBeEqualToNumber("entries[0].rootBounds.right", 312);
-      shouldBeEqualToNumber("entries[0].rootBounds.top", 458);
-      shouldBeEqualToNumber("entries[0].rootBounds.bottom", 658);
-      shouldEvaluateToSameObject("entries[0].target", target);
-      document.scrollingElement.scrollTop = 100;
-      requestAnimationFrame(step4);
-    });
-  }
-
-  function step4() {
-    setTimeout(function() {
-      shouldBeEqualToNumber("entries.length", 1);
-      root.scrollTop = 100;
-      requestAnimationFrame(step5);
-    });
-  }
-
-  function step5() {
-    setTimeout(function() {
       shouldBeEqualToNumber("entries.length", 2);
-      shouldBeEqualToNumber("entries[1].boundingClientRect.left", 18);
-      shouldBeEqualToNumber("entries[1].boundingClientRect.right", 118);
-      shouldBeEqualToNumber("entries[1].boundingClientRect.top", 818);
-      shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 918);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.left", 912);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.right", 1012);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.top", -192);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", -92);
       shouldBeEqualToNumber("entries[1].intersectionRect.left", 0);
       shouldBeEqualToNumber("entries[1].intersectionRect.right", 0);
       shouldBeEqualToNumber("entries[1].intersectionRect.top", 0);
       shouldBeEqualToNumber("entries[1].intersectionRect.bottom", 0);
-      shouldBeEqualToNumber("entries[1].rootBounds.left", 8);
-      shouldBeEqualToNumber("entries[1].rootBounds.right", 312);
-      shouldBeEqualToNumber("entries[1].rootBounds.top", 608);
-      shouldBeEqualToNumber("entries[1].rootBounds.bottom", 808);
+      shouldBeEqualToNumber("entries[1].rootBounds.left", -30);
+      shouldBeEqualToNumber("entries[1].rootBounds.right", 942);
+      shouldBeEqualToNumber("entries[1].rootBounds.top", -10);
+      shouldBeEqualToNumber("entries[1].rootBounds.bottom", 819);
       shouldEvaluateToSameObject("entries[1].target", target);
       finishTest();
+      document.scrollingElement.scrollLeft = 0;
       document.scrollingElement.scrollTop = 0;
     });
   }
-
-  requestAnimationFrame(step0);
-}
 </script>