Enqueuing new frames in a Surface should cause Displays to reaggregate it

content/browser/compositor/onscreen_display_client.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 "content/browser/compositor/onscreen_display_client.h"
 
 #include "cc/output/output_surface.h"
 #include "cc/surfaces/surface_factory.h"
 #include "cc/surfaces/surface_manager.h"
 #include "content/common/host_shared_bitmap_manager.h"
 
 namespace content {
 
 OnscreenDisplayClient::OnscreenDisplayClient(
     const scoped_refptr<cc::ContextProvider>& onscreen_context_provider,
     scoped_ptr<cc::OutputSurface> software_surface,
-    cc::SurfaceManager* manager)
+    cc::SurfaceManager* manager,
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
     : onscreen_context_provider_(onscreen_context_provider),
       software_surface_(software_surface.Pass()),
-      display_(new cc::Display(this,
-                               manager,
-                               HostSharedBitmapManager::current())) {
+      display_(
+          new cc::Display(this, manager, HostSharedBitmapManager::current())),
+      task_runner_(task_runner),
+      scheduled_draw_(false),
+      weak_ptr_factory_(this) {
 }
 
 OnscreenDisplayClient::~OnscreenDisplayClient() {
 }
 
 scoped_ptr<cc::OutputSurface> OnscreenDisplayClient::CreateOutputSurface() {
   if (!onscreen_context_provider_)
     return software_surface_.Pass();
   return make_scoped_ptr(new cc::OutputSurface(onscreen_context_provider_))
       .Pass();
 }
 
+void OnscreenDisplayClient::DisplayDamaged() {
+  if (scheduled_draw_)
+    return;
+  scheduled_draw_ = true;
+  task_runner_->PostTask(

[jamesr, 2014/08/11 22:04:43]

could you add some traces here and to ::Draw()? we'll want them

+      FROM_HERE,
+      base::Bind(&OnscreenDisplayClient::Draw, weak_ptr_factory_.GetWeakPtr()));
+}
+
+void OnscreenDisplayClient::Draw() {
+  scheduled_draw_ = false;
+  display_->Draw();
+}
+
 }  // namespace content