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

cc/stubs/float_size.h

Index: cc/stubs/float_size.h
diff --git a/cc/stubs/float_size.h b/cc/stubs/float_size.h
index acbd5daa41a373110f5be93d0a0105095a9da60d..d58fb4232445ce41345f68c2adee6c340bd1d9d5 100644
--- a/cc/stubs/float_size.h
+++ b/cc/stubs/float_size.h
@@ -38,6 +38,11 @@ public:
     {
     }
 
+    explicit FloatSize(gfx::SizeF size)
+        : WebCore::FloatSize(size.width(), size.height())
+    {
+    }
+
     operator gfx::SizeF() const { return gfx::SizeF(width(), height()); }
 };