DisplayCompositor should enforce invariant that frame size and device scale factor are fixed

cc/surfaces/surface.cc

Index: cc/surfaces/surface.cc
diff --git a/cc/surfaces/surface.cc b/cc/surfaces/surface.cc
index 3e16c6928a05e7f2d273785305693021a121491b..a4dcc60b4935e126a03415bec5105295aae09bc9 100644
--- a/cc/surfaces/surface.cc
+++ b/cc/surfaces/surface.cc
@@ -58,6 +58,22 @@ void Surface::SetPreviousFrameSurface(Surface* surface) {
 void Surface::QueueFrame(CompositorFrame frame, const DrawCallback& callback) {
   TakeLatencyInfoFromPendingFrame(&frame.metadata.latency_info);
 
+  if (!frame.render_pass_list.empty()) {
+    gfx::Size frame_size = frame.render_pass_list.back()->output_rect.size();
+    float device_scale_factor = frame.metadata.device_scale_factor;
+
+    SurfaceInfo surface_info(surface_id_, device_scale_factor, frame_size);
+
+    if (!surface_info_)
+      surface_info_ = surface_info;
+
+    if (surface_info_ != surface_info) {
+      DCHECK(factory_);
+      factory_->OnBadFrameReceived();
+      return;
+    }
+  }
+
   base::Optional<CompositorFrame> previous_pending_frame =
       std::move(pending_frame_);
   pending_frame_.reset();