Support impl-side painting in Mandoline.

components/html_viewer/web_layer_tree_view_impl.cc

 // Copyright 2014 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 "components/html_viewer/web_layer_tree_view_impl.h"
 
 #include "base/thread_task_runner_handle.h"
 #include "cc/blink/web_layer_impl.h"
 #include "cc/layers/layer.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/scheduler/begin_frame_source.h"
 #include "cc/trees/layer_tree_host.h"
 #include "components/view_manager/public/cpp/view.h"
 #include "mojo/cc/context_provider_mojo.h"
 #include "mojo/cc/output_surface_mojo.h"
 #include "mojo/converters/surfaces/surfaces_type_converters.h"
 #include "third_party/WebKit/public/web/WebWidget.h"
 
 namespace html_viewer {
 
 WebLayerTreeViewImpl::WebLayerTreeViewImpl(
     scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner,
+    gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
+    cc::TaskGraphRunner* task_graph_runner,
     mojo::SurfacePtr surface,
     mojo::GpuPtr gpu_service)
     : widget_(NULL),
       view_(NULL),
       main_thread_compositor_task_runner_(base::ThreadTaskRunnerHandle::Get()),
       weak_factory_(this) {
   main_thread_bound_weak_ptr_ = weak_factory_.GetWeakPtr();
 
   cc::LayerTreeSettings settings;
 
+  settings.impl_side_painting = true;
+  settings.use_image_texture_target = GL_TEXTURE_2D;
+  settings.use_one_copy = true;
+  // TODO(jam): use multiple compositor raster threads and set gather_pixel_refs
+  // accordingly (see content).
+
   // For web contents, layer transforms should scale up the contents of layers
   // to keep content always crisp when possible.
   settings.layer_transforms_should_scale_layer_contents = true;
 
   cc::SharedBitmapManager* shared_bitmap_manager = nullptr;
-  gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager = nullptr;
-  cc::TaskGraphRunner* task_graph_runner = nullptr;
 
   cc::LayerTreeHost::InitParams params;
   params.client = this;
   params.shared_bitmap_manager = shared_bitmap_manager;
   params.gpu_memory_buffer_manager = gpu_memory_buffer_manager;
   params.settings = &settings;
   params.task_graph_runner = task_graph_runner;
   params.main_task_runner = main_thread_compositor_task_runner_;
 
   layer_tree_host_ =
@@ skipping 188 matching lines @@
       base::Bind(&WebLayerTreeViewImpl::DidCreateSurfaceOnMainThread,
                  main_thread_bound_weak_ptr_,
                  id));
 }
 
 void WebLayerTreeViewImpl::DidCreateSurfaceOnMainThread(cc::SurfaceId id) {
   view_->SetSurfaceId(mojo::SurfaceId::From(id));
 }
 
 }  // namespace html_viewer