Bug 1479508 Part 1: Move devtools-specific function definitions in Element.webidl into a better-documented partial interface. r=bz

MozReview-Commit-ID: 6227lasylzN

--HG--
extra : rebase_source : f9cf8938d4cd01ceebc1adc2ffd078a98d928fae

dom/webidl/Element.webidl

@@ -71,8 +71,6 @@ interface Element : Node {
   HTMLCollection getElementsByTagNameNS(DOMString? namespace, DOMString localName);
   [Pure]
   HTMLCollection getElementsByClassName(DOMString classNames);
-  [ChromeOnly, Pure]
-  sequence<Element> getElementsWithGrid();
  
   [CEReactions, Throws, Pure]
   Element? insertAdjacentElement(DOMString where, Element element); // historical
@@ -156,25 +154,6 @@ interface Element : Node {
    */
   boolean scrollByNoFlush(long dx, long dy);
 
-  // Support reporting of Flexbox properties
-  /**
-   * If this element has a display:flex or display:inline-flex style,
-   * this property returns an object with computed values for flex
-   * properties, as well as a property that exposes the flex lines
-   * in this container.
-   */
-  [ChromeOnly, Pure]
-  Flex? getAsFlexContainer();
-
-  // Support reporting of Grid properties
-  /**
-   * If this element has a display:grid or display:inline-grid style,
-   * this property returns an object with computed values for grid
-   * tracks and lines.
-   */
-  [ChromeOnly, Pure]
-  sequence<Grid> getGridFragments();
-
   [ChromeOnly]
   DOMMatrixReadOnly getTransformToAncestor(Element ancestor);
   [ChromeOnly]
@@ -293,3 +272,33 @@ partial interface Element {
   [NeedsCallerType]
   void requestPointerLock();
 };
+
+// Mozilla-specific additions to support devtools
+partial interface Element {
+  // Support reporting of Flexbox properties
+  /**
+   * If this element has a display:flex or display:inline-flex style,
+   * this property returns an object with computed values for flex
+   * properties, as well as a property that exposes the flex lines
+   * in this container.
+   */
+  [ChromeOnly, Pure]
+  Flex? getAsFlexContainer();
+
+  // Support reporting of Grid properties
+  /**
+   * If this element has a display:grid or display:inline-grid style,
+   * this property returns an object with computed values for grid
+   * tracks and lines.
+   */
+  [ChromeOnly, Pure]
+  sequence<Grid> getGridFragments();
+  
+  /**
+   * Returns a sequence of all the descendent elements of this element
+   * that have display:grid or display:inline-grid style and generate
+   * a frame.
+   */
+  [ChromeOnly, Pure]
+  sequence<Element> getElementsWithGrid();
+};