Introduce ViewRoot forwarding input/view events to native

content/browser/renderer_host/compositor_impl_android.cc

 // Copyright (c) 2012 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 "content/browser/renderer_host/compositor_impl_android.h"
 
 #include <android/bitmap.h>
 #include <android/native_window_jni.h>
 #include <stdint.h>
 #include <unordered_set>
@@ skipping 305 matching lines @@
 
 // static
 bool CompositorImpl::IsInitialized() {
   return g_initialized;
 }
 
 CompositorImpl::CompositorImpl(CompositorClient* client,
                                gfx::NativeWindow root_window)
     : frame_sink_id_(
           ui::ContextProviderFactory::GetInstance()->AllocateFrameSinkId()),
+      root_layer_(cc::Layer::Create()),
       resource_manager_(root_window),
       device_scale_factor_(1),
       window_(NULL),
       surface_handle_(gpu::kNullSurfaceHandle),
       client_(client),
       root_window_(root_window),
       needs_animate_(false),
       pending_swapbuffers_(0U),
       num_successive_context_creation_failures_(0),
       compositor_frame_sink_request_pending_(false),
       weak_factory_(this) {
   ui::ContextProviderFactory::GetInstance()
       ->GetSurfaceManager()
       ->RegisterFrameSinkId(frame_sink_id_);
   DCHECK(client);
   DCHECK(root_window);
-  DCHECK(root_window->GetLayer() == nullptr);
-  root_window->SetLayer(cc::Layer::Create());
   readback_layer_tree_ = cc::Layer::Create();
   readback_layer_tree_->SetHideLayerAndSubtree(true);
-  root_window->GetLayer()->AddChild(readback_layer_tree_);
+  root_layer_->AddChild(readback_layer_tree_);
   root_window->AttachCompositor(this);
   CreateLayerTreeHost();
   resource_manager_.Init(host_->GetUIResourceManager());
 }
 
 CompositorImpl::~CompositorImpl() {
   root_window_->DetachCompositor();
-  root_window_->SetLayer(nullptr);
   // Clean-up any surface references.
   SetSurface(NULL);
   ui::ContextProviderFactory::GetInstance()
       ->GetSurfaceManager()
       ->InvalidateFrameSinkId(frame_sink_id_);
 }
 
 ui::UIResourceProvider& CompositorImpl::GetUIResourceProvider() {
   return *this;
 }
 
 ui::ResourceManager& CompositorImpl::GetResourceManager() {
   return resource_manager_;
 }
 
 void CompositorImpl::SetRootLayer(scoped_refptr<cc::Layer> root_layer) {
   if (subroot_layer_.get()) {
     subroot_layer_->RemoveFromParent();
     subroot_layer_ = NULL;
   }
-  if (root_window_->GetLayer()) {
-    subroot_layer_ = root_window_->GetLayer();
-    root_window_->GetLayer()->AddChild(root_layer);
+  if (root_layer.get()) {
+    subroot_layer_ = root_layer;
+    root_layer_->AddChild(root_layer);
   }
 }
 
 void CompositorImpl::SetSurface(jobject surface) {
   JNIEnv* env = base::android::AttachCurrentThread();
   gpu::GpuSurfaceTracker* tracker = gpu::GpuSurfaceTracker::Get();
 
   if (window_) {
     // Shut down GL context before unregistering surface.
     SetVisible(false);
@@ skipping 44 matching lines @@
   animation_host_ = cc::AnimationHost::CreateMainInstance();
 
   cc::LayerTreeHostInProcess::InitParams params;
   params.client = this;
   params.task_graph_runner = g_task_graph_runner.Pointer();
   params.main_task_runner = base::ThreadTaskRunnerHandle::Get();
   params.settings = &settings;
   params.mutator_host = animation_host_.get();
   host_ = cc::LayerTreeHostInProcess::CreateSingleThreaded(this, &params);
   DCHECK(!host_->IsVisible());
-  host_->GetLayerTree()->SetRootLayer(root_window_->GetLayer());
+  host_->GetLayerTree()->SetRootLayer(root_layer_);
   host_->SetFrameSinkId(frame_sink_id_);
   host_->GetLayerTree()->SetViewportSize(size_);
   SetHasTransparentBackground(false);
   host_->GetLayerTree()->SetDeviceScaleFactor(device_scale_factor_);
 
   if (needs_animate_)
     host_->SetNeedsAnimate();
 }
 
 void CompositorImpl::SetVisible(bool visible) {
@@ skipping 26 matching lines @@
 
 void CompositorImpl::SetWindowBounds(const gfx::Size& size) {
   if (size_ == size)
     return;
 
   size_ = size;
   if (host_)
     host_->GetLayerTree()->SetViewportSize(size);
   if (display_)
     display_->Resize(size);
-  root_window_->GetLayer()->SetBounds(size);
+  root_layer_->SetBounds(size);
 }
 
 void CompositorImpl::SetHasTransparentBackground(bool transparent) {
   has_transparent_background_ = transparent;
   if (host_) {
     host_->GetLayerTree()->set_has_transparent_background(transparent);
 
     // Give a delay in setting the background color to avoid the color for
     // the normal mode (white) affecting the UI transition.
     base::ThreadTaskRunnerHandle::Get().get()->PostDelayedTask(
@@ skipping 213 matching lines @@
 void CompositorImpl::DidCommit() {
   root_window_->OnCompositingDidCommit();
 }
 
 void CompositorImpl::AttachLayerForReadback(scoped_refptr<cc::Layer> layer) {
   readback_layer_tree_->AddChild(layer);
 }
 
 void CompositorImpl::RequestCopyOfOutputOnRootLayer(
     std::unique_ptr<cc::CopyOutputRequest> request) {
-  root_window_->GetLayer()->RequestCopyOfOutput(std::move(request));
+  root_layer_->RequestCopyOfOutput(std::move(request));
 }
 
 void CompositorImpl::SetNeedsAnimate() {
   needs_animate_ = true;
   if (!host_->IsVisible())
     return;
 
   TRACE_EVENT0("compositor", "Compositor::SetNeedsAnimate");
   host_->SetNeedsAnimate();
 }
 
 cc::FrameSinkId CompositorImpl::GetFrameSinkId() {
   return frame_sink_id_;
 }
 
 bool CompositorImpl::HavePendingReadbacks() {
   return !readback_layer_tree_->children().empty();
 }
 
 }  // namespace content