Enforce constant size and device scale factor for surfaces

cc/surfaces/surface_factory.cc

 // Copyright 2014 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 "cc/surfaces/surface_factory.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 40 matching lines @@
   TRACE_EVENT0("cc", "SurfaceFactory::SubmitCompositorFrame");
   DCHECK(local_surface_id.is_valid());
 
   for (ui::LatencyInfo& latency : frame.metadata.latency_info) {
     if (latency.latency_components().size() > 0) {
       latency.AddLatencyNumber(ui::DISPLAY_COMPOSITOR_RECEIVED_FRAME_COMPONENT,
                                0, 0);
     }
   }
 
+  SurfaceId surface_id(frame_sink_id_, local_surface_id);
+  gfx::Size frame_size;
+  if (!frame.render_pass_list.empty())
+    frame_size = frame.render_pass_list.back()->output_rect.size();
+  float device_scale_factor = frame.metadata.device_scale_factor;
+  SurfaceInfo surface_info(surface_id, device_scale_factor, frame_size);
+
   std::unique_ptr<Surface> surface;
   bool create_new_surface =
       (!current_surface_ ||
        local_surface_id != current_surface_->surface_id().local_surface_id());
   if (!create_new_surface) {
     surface = std::move(current_surface_);
   } else {
-    surface = Create(local_surface_id);
+    surface = Create(surface_info);
   }
   surface->QueueFrame(std::move(frame), callback, will_draw_callback);
 
   if (current_surface_ && create_new_surface) {
     surface->SetPreviousFrameSurface(current_surface_.get());
     Destroy(std::move(current_surface_));
   }
   current_surface_ = std::move(surface);
 }
 
@@ skipping 48 matching lines @@
 }
 
 void SurfaceFactory::OnSurfaceDependenciesChanged(
     Surface* surface,
     const SurfaceDependencies& added_dependencies,
     const SurfaceDependencies& removed_dependencies) {}
 
 void SurfaceFactory::OnSurfaceDiscarded(Surface* surface) {}
 
 std::unique_ptr<Surface> SurfaceFactory::Create(
-    const LocalSurfaceId& local_surface_id) {
+    const SurfaceInfo& surface_info) {
   seen_first_frame_activation_ = false;
   std::unique_ptr<Surface> surface =
-      manager_->CreateSurface(weak_factory_.GetWeakPtr(), local_surface_id);
+      manager_->CreateSurface(weak_factory_.GetWeakPtr(), surface_info);
   surface->AddObserver(this);
   return surface;
 }
 
 void SurfaceFactory::Destroy(std::unique_ptr<Surface> surface) {
   surface->RemoveObserver(this);
   manager_->DestroySurface(std::move(surface));
 }
 
 }  // namespace cc