Implement a method to access the non-composited content root layer picture pile.

cc/single_thread_proxy.cc

Index: cc/single_thread_proxy.cc
diff --git a/cc/single_thread_proxy.cc b/cc/single_thread_proxy.cc
index 91ac9520dd780d09804535fc3962a793fd1a3fce..f1ba4a4cd520aa732180043f6fe32394eefabc80 100644
--- a/cc/single_thread_proxy.cc
+++ b/cc/single_thread_proxy.cc
@@ -7,7 +7,11 @@
 #include "base/debug/trace_event.h"
 #include "cc/draw_quad.h"
 #include "cc/layer_tree_host.h"
+#include "cc/layer_tree_impl.h"
 #include "cc/output_surface.h"
+#include "cc/picture_layer.h"
+#include "cc/picture_layer_impl.h"
+#include "cc/picture_pile_impl.h"
 #include "cc/resource_update_controller.h"
 #include "cc/thread.h"
 
@@ -404,4 +408,15 @@ bool SingleThreadProxy::commitPendingForTesting()
     return false;
 }
 
+scoped_refptr<PicturePileImpl> SingleThreadProxy::capturePicturePile(const PictureLayer* layer)

[enne (OOO), 2013/01/02 19:35:22]

Please just make this a NOTREACHED().  Impl-side painting is only supported when
threaded compositing is turned on.

[Leandro Graciá Gil, 2013/01/03 20:32:10]

Done.

+{
+    LayerTreeImpl* tree = m_layerTreeHostImpl->pendingTree() ? m_layerTreeHostImpl->pendingTree() : m_layerTreeHostImpl->activeTree();
+    LayerImpl* layer_impl = tree->LayerById(layer->id());
+    if (!layer_impl)
+        return scoped_refptr<PicturePileImpl>();
+
+    const PictureLayerImpl* picture_layer_impl = static_cast<PictureLayerImpl*>(layer_impl);
+    return picture_layer_impl->pile()->CloneForDrawing();
+}
+
 }  // namespace cc