Introduce ViewRoot forwarding input/view events to native

content/browser/renderer_host/compositor_impl_android.cc

Index: content/browser/renderer_host/compositor_impl_android.cc
diff --git a/content/browser/renderer_host/compositor_impl_android.cc b/content/browser/renderer_host/compositor_impl_android.cc
index ebd54ca69802127c53b0794b8cac909e0a06f70a..8c9bff6bfda28421f8ada18982dee09552c73c3e 100644
--- a/content/browser/renderer_host/compositor_impl_android.cc
+++ b/content/browser/renderer_host/compositor_impl_android.cc
@@ -65,6 +65,7 @@
 #include "third_party/khronos/GLES2/gl2.h"
 #include "third_party/khronos/GLES2/gl2ext.h"
 #include "third_party/skia/include/core/SkMallocPixelRef.h"
+#include "ui/android/view_root.h"
 #include "ui/android/window_android.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
@@ -84,7 +85,7 @@ gpu::SharedMemoryLimits GetCompositorContextSharedMemoryLimits(
     gfx::NativeWindow window) {
   constexpr size_t kBytesPerPixel = 4;
   const gfx::Size size = display::Screen::GetScreen()
-                             ->GetDisplayNearestWindow(window)
+                             ->GetDisplayNearestWindowAndroid(window)
                              .GetSizeInPixel();
   const size_t full_screen_texture_size_in_bytes =
       size.width() * size.height() * kBytesPerPixel;
@@ -309,8 +310,8 @@ base::LazyInstance<SingleThreadTaskGraphRunner> g_task_graph_runner =
 
 // static
 Compositor* Compositor::Create(CompositorClient* client,
-                               gfx::NativeWindow root_window) {
-  return client ? new CompositorImpl(client, root_window) : NULL;
+                               ui::ViewRoot* view_root) {
+  return client ? new CompositorImpl(client, view_root) : NULL;
 }
 
 // static
@@ -325,14 +326,15 @@ bool CompositorImpl::IsInitialized() {
 }
 
 CompositorImpl::CompositorImpl(CompositorClient* client,
-                               gfx::NativeWindow root_window)
+                               ui::ViewRoot* view_root)
     : frame_sink_id_(
           ui::ContextProviderFactory::GetInstance()->AllocateFrameSinkId()),
-      resource_manager_(root_window),
+      resource_manager_(view_root->GetWindowAndroid()),
       window_(NULL),
       surface_handle_(gpu::kNullSurfaceHandle),
       client_(client),
-      root_window_(root_window),
+      root_window_(view_root->GetWindowAndroid()),
+      view_root_(view_root),
       needs_animate_(false),
       pending_swapbuffers_(0U),
       num_successive_context_creation_failures_(0),
@@ -342,20 +344,20 @@ CompositorImpl::CompositorImpl(CompositorClient* client,
       ->GetSurfaceManager()
       ->RegisterFrameSinkId(frame_sink_id_);
   DCHECK(client);
-  DCHECK(root_window);
-  DCHECK(root_window->GetLayer() == nullptr);
-  root_window->SetLayer(cc::Layer::Create());
+  DCHECK(view_root);
+  DCHECK(view_root->GetLayer() == nullptr);
+  view_root->SetLayer(cc::Layer::Create());
   readback_layer_tree_ = cc::Layer::Create();
   readback_layer_tree_->SetHideLayerAndSubtree(true);
-  root_window->GetLayer()->AddChild(readback_layer_tree_);
-  root_window->AttachCompositor(this);
+  view_root->GetLayer()->AddChild(readback_layer_tree_);
+  root_window_->AttachCompositor(this);
   CreateLayerTreeHost();
   resource_manager_.Init(host_->GetUIResourceManager());
 }
 
 CompositorImpl::~CompositorImpl() {
   root_window_->DetachCompositor();
-  root_window_->SetLayer(nullptr);
+  view_root_->SetLayer(nullptr);
   // Clean-up any surface references.
   SetSurface(NULL);
   ui::ContextProviderFactory::GetInstance()
@@ -376,9 +378,9 @@ void CompositorImpl::SetRootLayer(scoped_refptr<cc::Layer> root_layer) {
     subroot_layer_->RemoveFromParent();
     subroot_layer_ = NULL;
   }
-  if (root_window_->GetLayer()) {
-    subroot_layer_ = root_window_->GetLayer();
-    root_window_->GetLayer()->AddChild(root_layer);
+  if (view_root_->GetLayer()) {
+    subroot_layer_ = view_root_->GetLayer();
+    view_root_->GetLayer()->AddChild(root_layer);
   }
 }
 
@@ -443,7 +445,7 @@ void CompositorImpl::CreateLayerTreeHost() {
   params.mutator_host = animation_host_.get();
   host_ = cc::LayerTreeHostInProcess::CreateSingleThreaded(this, &params);
   DCHECK(!host_->IsVisible());
-  host_->GetLayerTree()->SetRootLayer(root_window_->GetLayer());
+  host_->GetLayerTree()->SetRootLayer(view_root_->GetLayer());
   host_->SetFrameSinkId(frame_sink_id_);
   host_->GetLayerTree()->SetViewportSize(size_);
   SetHasTransparentBackground(false);
@@ -484,7 +486,7 @@ void CompositorImpl::SetWindowBounds(const gfx::Size& size) {
     host_->GetLayerTree()->SetViewportSize(size);
   if (display_)
     display_->Resize(size);
-  root_window_->GetLayer()->SetBounds(size);
+  view_root_->GetLayer()->SetBounds(size);
 }
 
 void CompositorImpl::SetHasTransparentBackground(bool transparent) {
@@ -719,7 +721,7 @@ void CompositorImpl::AttachLayerForReadback(scoped_refptr<cc::Layer> layer) {
 
 void CompositorImpl::RequestCopyOfOutputOnRootLayer(
     std::unique_ptr<cc::CopyOutputRequest> request) {
-  root_window_->GetLayer()->RequestCopyOfOutput(std::move(request));
+  view_root_->GetLayer()->RequestCopyOfOutput(std::move(request));
 }
 
 void CompositorImpl::SetNeedsAnimate() {