DirectRenderer allows empty swap rects for CommitOverlayPlanes

cc/test/test_web_graphics_context_3d.h

Index: cc/test/test_web_graphics_context_3d.h
diff --git a/cc/test/test_web_graphics_context_3d.h b/cc/test/test_web_graphics_context_3d.h
index 8fa4496845df301c8b94385b7ef3b9862f074d01..4e6d76115ea75deebe1eb08236ed68debac3a8bf 100644
--- a/cc/test/test_web_graphics_context_3d.h
+++ b/cc/test/test_web_graphics_context_3d.h
@@ -314,6 +314,9 @@ class TestWebGraphicsContext3D {
   void set_have_post_sub_buffer(bool have) {
     test_capabilities_.gpu.post_sub_buffer = have;
   }
+  void set_have_commit_overlay_planes(bool have) {
+    test_capabilities_.gpu.commit_overlay_planes = have;
+  }
   void set_have_discard_framebuffer(bool have) {
     test_capabilities_.gpu.discard_framebuffer = have;
   }