Reusing base::IdType<...> to implement SurfaceId.

components/html_viewer/html_frame.cc

 // Copyright 2015 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 "components/html_viewer/html_frame.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/bind.h"
@@ skipping 623 matching lines @@
       blink::WebRemoteFrame::create(state_.tree_scope, this);
   remote_frame->initializeFromFrame(web_frame_->toWebLocalFrame());
   // swap() ends up calling us back and we then close the frame, which deletes
   // it.
   web_frame_->swap(remote_frame);
   if (owned_window_) {
     surface_layer_ =
           cc::SurfaceLayer::Create(cc_blink::WebLayerImpl::LayerSettings(),
                                    base::Bind(&SatisfyCallback),
                                    base::Bind(&RequireCallback));
-    surface_layer_->SetSurfaceId(cc::SurfaceId(owned_window_->window()->id()),
-                                 global_state()->device_pixel_ratio(),
-                                 owned_window_->window()->bounds().size());
+    surface_layer_->SetSurfaceId(
+        cc::SurfaceId::FromUnsafeValue(owned_window_->window()->id()),
+        global_state()->device_pixel_ratio(),
+        owned_window_->window()->bounds().size());
 
     web_layer_.reset(new cc_blink::WebLayerImpl(surface_layer_));
   }
   remote_frame->setRemoteWebLayer(web_layer_.get());
   remote_frame->setReplicatedName(state_.name);
   remote_frame->setReplicatedOrigin(state_.origin);
   remote_frame->setReplicatedSandboxFlags(state_.sandbox_flags);
 
   // Tell the frame that it is actually loading. This prevents its parent
   // from prematurely dispatching load event.
@@ skipping 367 matching lines @@
 
   const gfx::Rect rect_in_dip(frame_rect.x, frame_rect.y, frame_rect.width,
                               frame_rect.height);
   const gfx::Rect rect_in_pixels(gfx::ConvertRectToPixel(
       global_state()->device_pixel_ratio(), rect_in_dip));
   owned_window_->window()->SetBounds(rect_in_pixels);
 
   if (!surface_layer_)
     return;
 
-  surface_layer_->SetSurfaceId(cc::SurfaceId(owned_window_->window()->id()),
-                               global_state()->device_pixel_ratio(),
-                               owned_window_->window()->bounds().size());
+  surface_layer_->SetSurfaceId(
+      cc::SurfaceId::FromUnsafeValue(owned_window_->window()->id()),
+      global_state()->device_pixel_ratio(),
+      owned_window_->window()->bounds().size());
 }
 
 }  // namespace mojo