diff --git content/browser/compositor/gpu_process_transport_factory.cc content/browser/compositor/gpu_process_transport_factory.cc
index ea713fd..e4119f6 100644
--- content/browser/compositor/gpu_process_transport_factory.cc
+++ content/browser/compositor/gpu_process_transport_factory.cc
@@ -188,6 +188,13 @@ GpuProcessTransportFactory::~GpuProcessTransportFactory() {
 std::unique_ptr<cc::SoftwareOutputDevice>
 GpuProcessTransportFactory::CreateSoftwareOutputDevice(
     ui::Compositor* compositor) {
+  if (compositor->delegate()) {
+    std::unique_ptr<cc::SoftwareOutputDevice> output_device =
+        compositor->delegate()->CreateSoftwareOutputDevice(compositor);
+    if (output_device)
+      return output_device;
+  }
+
 #if defined(MOJO_RUNNER_CLIENT)
   if (IsRunningInMojoShell()) {
     return std::unique_ptr<cc::SoftwareOutputDevice>(
diff --git ui/compositor/compositor.h ui/compositor/compositor.h
index a6245da..edfdeb5c 100644
--- ui/compositor/compositor.h
+++ ui/compositor/compositor.h
@@ -17,6 +17,7 @@
 #include "base/single_thread_task_runner.h"
 #include "base/time/time.h"
 #include "cc/output/begin_frame_args.h"
+#include "cc/output/software_output_device.h"
 #include "cc/surfaces/surface_sequence.h"
 #include "cc/trees/layer_tree_host_client.h"
 #include "cc/trees/layer_tree_host_single_thread_client.h"
@@ -156,6 +157,17 @@ class COMPOSITOR_EXPORT CompositorLock
   DISALLOW_COPY_AND_ASSIGN(CompositorLock);
 };
 
+class COMPOSITOR_EXPORT CompositorDelegate {
+ public:
+  virtual std::unique_ptr<cc::SoftwareOutputDevice> CreateSoftwareOutputDevice(
+      ui::Compositor* compositor) {
+    return nullptr;
+  }
+
+ protected:
+  virtual ~CompositorDelegate() {}
+};
+
 // Compositor object to take care of GPU painting.
 // A Browser compositor object is responsible for generating the final
 // displayable form of pixels comprising a single widget's contents. It draws an
@@ -176,6 +188,9 @@ class COMPOSITOR_EXPORT Compositor
   // Schedules a redraw of the layer tree associated with this compositor.
   void ScheduleDraw();
 
+  CompositorDelegate* delegate() const { return delegate_; }
+  void SetDelegate(CompositorDelegate* delegate) { delegate_ = delegate; }
+
   // Sets the root of the layer tree drawn by this Compositor. The root layer
   // must have no parent. The compositor's root layer is reset if the root layer
   // is destroyed. NULL can be passed to reset the root layer, in which case the
@@ -345,6 +360,8 @@ class COMPOSITOR_EXPORT Compositor
 
   ui::ContextFactory* context_factory_;
 
+  CompositorDelegate* delegate_ = nullptr;
+
   // The root of the Layer tree drawn by this compositor.
   Layer* root_layer_;