Overlays: Remove special casing of primary overlay plane

cc/output/gl_renderer_unittest.cc

Index: cc/output/gl_renderer_unittest.cc
diff --git a/cc/output/gl_renderer_unittest.cc b/cc/output/gl_renderer_unittest.cc
index bd6eeb9f03152b82167cbaf869edd4549091be65..f94300ef91f15aab64ab8520b86962a0c9d856bc 100644
--- a/cc/output/gl_renderer_unittest.cc
+++ b/cc/output/gl_renderer_unittest.cc
@@ -2224,8 +2224,13 @@ TEST_F(GLRendererTest, OverlaySyncPointsAreProcessed) {
   // though it's not drawn, that its sync point is waited on.
   EXPECT_CALL(*context, waitSyncPoint(sync_point)).Times(1);
   EXPECT_CALL(overlay_scheduler,
+              Schedule(0, gfx::OVERLAY_TRANSFORM_NONE, _, viewport_rect,
+                       gfx::RectF(0, 0, 1, 1)))
+      .Times(1);
+  EXPECT_CALL(overlay_scheduler,
               Schedule(1, gfx::OVERLAY_TRANSFORM_NONE, _, viewport_rect,
-                       BoundingRect(uv_top_left, uv_bottom_right))).Times(1);
+                       BoundingRect(uv_top_left, uv_bottom_right)))
+      .Times(1);
 
   renderer.DrawFrame(&render_passes_in_draw_order_, 1.f, viewport_rect,
                      viewport_rect, false);