GeometryInterface: Add DOMMatrixInit and fromMatrix().

third_party/WebKit/Source/core/dom/DOMMatrix.idl

Index: third_party/WebKit/Source/core/dom/DOMMatrix.idl
diff --git a/third_party/WebKit/Source/core/dom/DOMMatrix.idl b/third_party/WebKit/Source/core/dom/DOMMatrix.idl
index 44a684e6eb962e37194f38f61fc1272dfef32d91..02f21de4ffe8f9cabd26b2627660d0cb983f6d41 100644
--- a/third_party/WebKit/Source/core/dom/DOMMatrix.idl
+++ b/third_party/WebKit/Source/core/dom/DOMMatrix.idl
@@ -11,6 +11,8 @@
     // FIXME: Exposed=(Window,Worker)
     RuntimeEnabled=GeometryInterfaces,
 ] interface DOMMatrix : DOMMatrixReadOnly {
+    [RaisesException, NewObject] static DOMMatrix fromMatrix(optional DOMMatrixInit other);
+
     // These attributes are simple aliases for certain elements of the 4x4 matrix
     inherit attribute unrestricted double a;
     inherit attribute unrestricted double b;
@@ -38,8 +40,8 @@
 
     // FIXME: Should implement some methods (See: crbug.com/388780)

[dominicc (has gone to gerrit), 2016/09/12 05:19:43]

Might be nice to update add a comment to this bug with a list summarizing what
work remains, and link to that comment? That issue is a lot to trace through
now.

[zino, 2016/09/12 09:12:42]

Done.

     // Mutable transform methods
-    DOMMatrix multiplySelf(DOMMatrix other);
-    DOMMatrix preMultiplySelf(DOMMatrix other);
+    [RaisesException] DOMMatrix multiplySelf(optional DOMMatrixInit other);
+    [RaisesException] DOMMatrix preMultiplySelf(optional DOMMatrixInit other);
     DOMMatrix translateSelf(unrestricted double tx,
                             unrestricted double ty,
                             optional unrestricted double tz = 0);