Adding Blink-side 3d Box and Bounds calculations to TransformOperations

Source/platform/transforms/TransformationMatrix.cpp

Index: Source/platform/transforms/TransformationMatrix.cpp
diff --git a/Source/platform/transforms/TransformationMatrix.cpp b/Source/platform/transforms/TransformationMatrix.cpp
index ba4713bc4ee7020daab6c6d4f5a2c11e059dc7e7..4403d3e7ec91180ff8865f15023b1a11d25ce89b 100644
--- a/Source/platform/transforms/TransformationMatrix.cpp
+++ b/Source/platform/transforms/TransformationMatrix.cpp
@@ -28,6 +28,7 @@
 #include "config.h"
 #include "platform/transforms/TransformationMatrix.h"
 
+#include "platform/geometry/FloatBox.h"
 #include "platform/geometry/FloatQuad.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntRect.h"
@@ -646,6 +647,28 @@ LayoutRect TransformationMatrix::clampedBoundsOfProjectedQuad(const FloatQuad& q
     return LayoutRect(LayoutUnit::clamp(left), LayoutUnit::clamp(top),  LayoutUnit::clamp(right - left), LayoutUnit::clamp(bottom - top));
 }
 
+void TransformationMatrix::transformBox(FloatBox& box) const
+{
+    FloatBox bounds;
+    bool firstPoint = true;
+    for (size_t i = 0; i < 2; ++i) {
+        for (size_t j = 0; j < 2; ++j) {
+            for (size_t k = 0; k < 2; ++k) {
+                FloatPoint3D point(box.x(), box.y(), box.z());
+                point += FloatPoint3D(i * box.width(), j * box.height(), k * box.depth());
+                point = mapPoint(point);
+                if (firstPoint) {
+                    bounds.setOrigin(point);
+                    firstPoint = false;
+                } else {
+                    bounds.expandTo(point);
+                }
+            }
+        }
+    }
+    box = bounds;
+}
+
 FloatPoint TransformationMatrix::mapPoint(const FloatPoint& p) const
 {
     if (isIdentityOrTranslation())