Attempt 2 at:...

app/gfx/path_gtk.cc

Index: app/gfx/path_gtk.cc
===================================================================
--- app/gfx/path_gtk.cc	(revision 30929)
+++ app/gfx/path_gtk.cc	(working copy)
@@ -11,7 +11,7 @@
 
 namespace gfx {
 
-GdkRegion* Path::CreateGdkRegion() const {
+GdkRegion* Path::CreateNativeRegion() const {
   int point_count = getPoints(NULL, 0);
   if (point_count <= 1) {
     // NOTE: ideally this would return gdk_empty_region, but that returns a
@@ -31,4 +31,25 @@
   return gdk_region_polygon(gdk_points.get(), point_count, GDK_EVEN_ODD_RULE);
 }
 
+// static
+NativeRegion Path::IntersectRegions(NativeRegion r1, NativeRegion r2) {
+  GdkRegion* copy = gdk_region_copy(r1);
+  gdk_region_intersect(copy, r2);
+  return copy;
+}
+
+// static
+NativeRegion Path::CombineRegions(NativeRegion r1, NativeRegion r2) {
+  GdkRegion* copy = gdk_region_copy(r1);
+  gdk_region_union(copy, r2);
+  return copy;
+}
+
+// static
+NativeRegion Path::SubtractRegion(NativeRegion r1, NativeRegion r2) {
+  GdkRegion* copy = gdk_region_copy(r1);
+  gdk_region_subtract(copy, r2);
+  return copy;
+}
+
 }  // namespace gfx