Add the DelegatingRenderer class with its initialize path.

cc/layer_tree_host_impl.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layer_tree_host_impl.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/debug/trace_event.h"
 #include "base/stl_util.h"
 #include "cc/append_quads_data.h"
 #include "cc/damage_tracker.h"
 #include "cc/debug_rect_history.h"
 #include "cc/delay_based_time_source.h"
+#include "cc/delegating_renderer.h"
 #include "cc/frame_rate_counter.h"
 #include "cc/gl_renderer.h"
 #include "cc/heads_up_display_layer_impl.h"
 #include "cc/layer_iterator.h"
 #include "cc/layer_tree_host.h"
 #include "cc/layer_tree_host_common.h"
 #include "cc/math_util.h"
 #include "cc/overdraw_metrics.h"
 #include "cc/page_scale_animation.h"
 #include "cc/prioritized_resource_manager.h"
@@ skipping 940 matching lines @@
     if (!outputSurface->BindToClient(this))
         return false;
 
     scoped_ptr<ResourceProvider> resourceProvider = ResourceProvider::create(outputSurface.get());
     if (!resourceProvider)
         return false;
 
     if (m_settings.implSidePainting)
       m_tileManager.reset(new TileManager(this, resourceProvider.get(), m_settings.numRasterThreads));
 
-    if (outputSurface->Context3D())
+    if (outputSurface->Capabilities().has_parent_compositor)
+        m_renderer = DelegatingRenderer::Create(this, resourceProvider.get());
+    else if (outputSurface->Context3D())
         m_renderer = GLRenderer::create(this, resourceProvider.get());
     else if (outputSurface->SoftwareDevice())
         m_renderer = SoftwareRenderer::create(this, resourceProvider.get(), outputSurface->SoftwareDevice());
     if (!m_renderer)
         return false;
 
     m_resourceProvider = resourceProvider.Pass();
     m_outputSurface = outputSurface.Pass();
 
     if (!m_visible)
@@ skipping 634 matching lines @@
 
 void LayerTreeHostImpl::UnregisterAnimationController(LayerAnimationController* controller) {
 #if !defined(NDEBUG)
     if (ContainsKey(m_allAnimationControllers, controller))
         m_allAnimationControllers.erase(controller);
 #endif
     DidDeactivateAnimationController(controller);
 }
 
 }  // namespace cc