Stop painting when receiving delegated frame

ui/compositor/layer.cc

Index: ui/compositor/layer.cc
diff --git a/ui/compositor/layer.cc b/ui/compositor/layer.cc
index aa97a567251ee0b7d02bad03b1089c28a80ed3a6..9bbdd454dfc346bcfd8df2af92dca4a0a7a8742a 100644
--- a/ui/compositor/layer.cc
+++ b/ui/compositor/layer.cc
@@ -690,6 +690,12 @@ void Layer::OnDeviceScaleFactorChanged(float device_scale_factor) {
     layer_mask_->OnDeviceScaleFactorChanged(device_scale_factor);
 }
 
+void Layer::OnDelegatedFrameDamage(const gfx::Rect &damage_rect_in_dip) {

[enne (OOO), 2014/08/21 20:54:19]

piman, danakj: removed DCHECK about having a delegated_renderer_layer_ or
texture_layer_ here.

Unfortunately this outline of code makes that problematic:

DelegatedFrameHost::SwapDelegatedFrame
  if (output_surface_id != last_output_surface_id_)
    DelegatedFrameHost::EvictDelegatedFrame
      Layer::SetShowPaintedContent
        Layer::SwitchToLayer(content or picture layer)
  Layer::OnDelegatedFrameData
    DCHECK(is a delegated renderer layer)
    BOOM

[enne (OOO), 2014/08/22 17:26:04]

danakj (or piman): PTAL?

+  if (!delegate_)
+    return;
+  delegate_->OnDelegatedFrameDamage(damage_rect_in_dip);
+}
+
 void Layer::RequestCopyOfOutput(scoped_ptr<cc::CopyOutputRequest> request) {
   cc_layer_->RequestCopyOfOutput(request.Pass());
 }