cc: Use gfx:: Geometry types for positions, bounds, and related things.

cc/stubs/float_point_3d.h

Index: cc/stubs/float_point_3d.h
diff --git a/cc/stubs/float_point_3d.h b/cc/stubs/float_point_3d.h
index 02ff076d7ff347e2367752fdffab2c5efd4d4d02..92e036f47d28f61da6b2b21c335fa265c06ee7c9 100644
--- a/cc/stubs/float_point_3d.h
+++ b/cc/stubs/float_point_3d.h
@@ -39,10 +39,16 @@ public:
     {
     }
 
+    
     FloatPoint3D(WebCore::FloatPoint point)
         : WebCore::FloatPoint3D(point)
     {
     }
+
+    explicit FloatPoint3D(gfx::PointF point)
+        : WebCore::FloatPoint3D(point.x(), point.y(), 0)
+    {
+    }
 };
 
 }