WIP: Surface Synchronization System

content/renderer/mus/renderer_window_tree_client.cc

Index: content/renderer/mus/renderer_window_tree_client.cc
diff --git a/content/renderer/mus/renderer_window_tree_client.cc b/content/renderer/mus/renderer_window_tree_client.cc
index 8cb2e6572ecd1fb25ff4845ff28c7269d4b496a9..f6d859723992e525293c5668c4bda7a6c050de48 100644
--- a/content/renderer/mus/renderer_window_tree_client.cc
+++ b/content/renderer/mus/renderer_window_tree_client.cc
@@ -6,7 +6,13 @@
 
 #include <map>
 
+#include "base/command_line.h"
 #include "base/lazy_instance.h"
+#include "cc/base/switches.h"
+#include "content/renderer/gpu/render_widget_compositor.h"
+#include "content/renderer/render_frame_impl.h"
+#include "content/renderer/render_view_impl.h"
+#include "content/renderer/render_widget.h"
 #include "services/ui/public/cpp/client_compositor_frame_sink.h"
 
 namespace content {
@@ -139,7 +145,24 @@ void RendererWindowTreeClient::OnWindowBoundsChanged(
     ui::Id window_id,
     const gfx::Rect& old_bounds,
     const gfx::Rect& new_bounds,
-    const base::Optional<cc::LocalSurfaceId>& local_surface_id) {}
+    const base::Optional<cc::LocalSurfaceId>& local_surface_id) {
+  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
+          cc::switches::kEnableSurfaceSynchronization)) {
+    return;
+  }
+  current_local_surface_id_ = *local_surface_id;
+  RenderFrameImpl* render_frame = RenderFrameImpl::FromRoutingID(routing_id_);
+  RenderViewImpl* render_view = RenderViewImpl::FromRoutingID(routing_id_);
+  if (!render_frame && !render_view)
+    return;
+  RenderWidget* widget =
+      render_frame ? render_frame->GetRenderWidget() : render_view->GetWidget();
+  if (!widget)
+    return;
+  // TODO(fsamuel): This isn't quite correct. The resize arrives from the
+  // browser and so it might not synchronize with the LocalSurfaceId.
+  widget->compositor()->SetLocalSurfaceId(*local_surface_id);
+}
 
 void RendererWindowTreeClient::OnClientAreaChanged(
     uint32_t window_id,
@@ -247,6 +270,11 @@ void RendererWindowTreeClient::OnPerformDragDropCompleted(
 
 void RendererWindowTreeClient::OnDragDropDone() {}
 
+void RendererWindowTreeClient::OnSetWindowBoundsResponse(
+    uint32_t change_id,
+    const gfx::Rect& bounds,
+    const cc::LocalSurfaceId& local_surface_id) {}
+
 void RendererWindowTreeClient::OnChangeCompleted(uint32_t change_id,
                                                  bool success) {}