Add observers to FrameSinkManagerHost.

content/browser/renderer_host/offscreen_canvas_provider_impl.cc

Index: content/browser/renderer_host/offscreen_canvas_provider_impl.cc
diff --git a/content/browser/renderer_host/offscreen_canvas_provider_impl.cc b/content/browser/renderer_host/offscreen_canvas_provider_impl.cc
index 7e9567aa75ff46b6d98ba106223d798778c43c49..5b5d0ff9eb017510d2070951b86e678cd8551b4b 100644
--- a/content/browser/renderer_host/offscreen_canvas_provider_impl.cc
+++ b/content/browser/renderer_host/offscreen_canvas_provider_impl.cc
@@ -4,8 +4,6 @@
 
 #include "content/browser/renderer_host/offscreen_canvas_provider_impl.h"
 
-#include "content/browser/compositor/surface_utils.h"
-#include "content/browser/renderer_host/offscreen_canvas_compositor_frame_sink_manager.h"
 #include "content/browser/renderer_host/offscreen_canvas_surface_impl.h"
 
 namespace content {
@@ -21,6 +19,11 @@ void OffscreenCanvasProviderImpl::Add(
   bindings_.AddBinding(this, std::move(request));
 }
 
+void OffscreenCanvasProviderImpl::DestroyOffscreenCanvasSurface(
+    const cc::FrameSinkId& frame_sink_id) {
+  surfaces_.erase(frame_sink_id);
+}
+
 void OffscreenCanvasProviderImpl::CreateOffscreenCanvasSurface(
     const cc::FrameSinkId& parent_frame_sink_id,
     const cc::FrameSinkId& frame_sink_id,
@@ -36,8 +39,9 @@ void OffscreenCanvasProviderImpl::CreateOffscreenCanvasSurface(
     return;
   }
 
-  OffscreenCanvasSurfaceImpl::Create(parent_frame_sink_id, frame_sink_id,
-                                     std::move(client), std::move(request));
+  surfaces_[frame_sink_id] = base::MakeUnique<OffscreenCanvasSurfaceImpl>(
+      parent_frame_sink_id, frame_sink_id, this, std::move(client),
+      std::move(request));
 }
 
 void OffscreenCanvasProviderImpl::CreateCompositorFrameSink(
@@ -50,15 +54,13 @@ void OffscreenCanvasProviderImpl::CreateCompositorFrameSink(
     return;
   }
 
-  // TODO(kylechar): Add test for bad |frame_sink_id|.
-  auto* manager = OffscreenCanvasCompositorFrameSinkManager::GetInstance();
-  auto* surface_impl = manager->GetSurfaceInstance(frame_sink_id);
-  if (!surface_impl) {
+  auto iter = surfaces_.find(frame_sink_id);
+  if (iter == surfaces_.end()) {
     DLOG(ERROR) << "No OffscreenCanvasSurfaceImpl for " << frame_sink_id;
     return;
   }
 
-  surface_impl->CreateCompositorFrameSink(std::move(client),
+  iter->second->CreateCompositorFrameSink(std::move(client),
                                           std::move(request));
 }