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

content/browser/renderer_host/render_widget_host_input_event_router.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 "content/browser/renderer_host/render_widget_host_input_event_router.h"
 
 #include "cc/quads/surface_draw_quad.h"
 #include "cc/surfaces/surface_id_allocator.h"
 #include "cc/surfaces/surface_manager.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/common/frame_messages.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
 namespace content {
 
 RenderWidgetHostInputEventRouter::HittestDelegate::HittestDelegate(
-    const std::unordered_map<cc::SurfaceId, HittestData, cc::SurfaceIdHash>&
+    const std::unordered_map<cc::SurfaceId, HittestData, cc::SurfaceId::Hasher>&
         hittest_data)
     : hittest_data_(hittest_data) {}
 
 bool RenderWidgetHostInputEventRouter::HittestDelegate::RejectHitTarget(
     const cc::SurfaceDrawQuad* surface_quad,
     const gfx::Point& point_in_quad_space) {
   auto it = hittest_data_.find(surface_quad->surface_id);
   if (it != hittest_data_.end() && it->second.ignored_for_hittest)
     return true;
   return false;
@@ skipping 141 matching lines @@
   if (owner_map_.find(cc::SurfaceIdAllocator::NamespaceForId(
           params.surface_id)) == owner_map_.end()) {
     return;
   }
   HittestData data;
   data.ignored_for_hittest = params.ignored_for_hittest;
   hittest_data_[params.surface_id] = data;
 }
 
 }  // namespace content