Privatize StrongBinding lifetime management

content/browser/renderer_host/offscreen_canvas_surface_impl.cc

 // Copyright 2016 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/offscreen_canvas_surface_impl.h"
 
 #include "base/bind_helpers.h"
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_manager.h"
 #include "content/browser/compositor/surface_utils.h"
 #include "content/public/browser/browser_thread.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
 
 namespace content {
 
-// static
-void OffscreenCanvasSurfaceImpl::Create(
-    mojo::InterfaceRequest<blink::mojom::OffscreenCanvasSurface> request) {
-  // |binding_| will take ownership of OffscreenCanvasSurfaceImpl
-  new OffscreenCanvasSurfaceImpl(std::move(request));
-}
-
-OffscreenCanvasSurfaceImpl::OffscreenCanvasSurfaceImpl(
-    mojo::InterfaceRequest<blink::mojom::OffscreenCanvasSurface> request)
-    : id_allocator_(new cc::SurfaceIdAllocator(AllocateSurfaceClientId())),
-      binding_(this, std::move(request)) {
+OffscreenCanvasSurfaceImpl::OffscreenCanvasSurfaceImpl()
+    : id_allocator_(new cc::SurfaceIdAllocator(AllocateSurfaceClientId())) {
   GetSurfaceManager()->RegisterSurfaceClientId(id_allocator_->client_id());
 }
 
 OffscreenCanvasSurfaceImpl::~OffscreenCanvasSurfaceImpl() {
   if (!GetSurfaceManager()) {
     // Inform both members that SurfaceManager's no longer alive to
     // avoid their destruction errors.
     if (surface_factory_)
         surface_factory_->DidDestroySurfaceManager();
   } else {
     GetSurfaceManager()->InvalidateSurfaceClientId(id_allocator_->client_id());
   }
   surface_factory_->Destroy(surface_id_);
 }
 
+// static
+void OffscreenCanvasSurfaceImpl::Create(
+    mojo::InterfaceRequest<blink::mojom::OffscreenCanvasSurface> request) {
+  mojo::MakeStrongBinding(base::MakeUnique<OffscreenCanvasSurfaceImpl>(),
+                          std::move(request));
+}
+
 void OffscreenCanvasSurfaceImpl::GetSurfaceId(
     const GetSurfaceIdCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   surface_id_ = id_allocator_->GenerateId();
 
   callback.Run(surface_id_);
 }
 
 void OffscreenCanvasSurfaceImpl::RequestSurfaceCreation(
@@ skipping 29 matching lines @@
     const cc::ReturnedResourceArray& resources) {}
 
 void OffscreenCanvasSurfaceImpl::WillDrawSurface(const cc::SurfaceId& id,
                                                  const gfx::Rect& damage_rect) {
 }
 
 void OffscreenCanvasSurfaceImpl::SetBeginFrameSource(
     cc::BeginFrameSource* begin_frame_source) {}
 
 }  // namespace content