Add SwapPromise support to LayerTreeHost and LayerTreeImpl

cc/trees/layer_tree_host.h

 // Copyright 2011 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.
 
 #ifndef CC_TREES_LAYER_TREE_HOST_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include <limits>
 #include <list>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/cancelable_callback.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "cc/animation/animation_events.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/scoped_ptr_vector.h"
+#include "cc/base/swap_promise.h"
 #include "cc/debug/micro_benchmark.h"
 #include "cc/debug/micro_benchmark_controller.h"
 #include "cc/input/input_handler.h"
 #include "cc/input/scrollbar.h"
 #include "cc/input/top_controls_state.h"
 #include "cc/layers/layer_lists.h"
 #include "cc/output/output_surface.h"
 #include "cc/resources/resource_format.h"
 #include "cc/resources/scoped_ui_resource.h"
 #include "cc/resources/ui_resource_bitmap.h"
@@ skipping 288 matching lines @@
 
   virtual gfx::Size GetUIResourceSize(UIResourceId id) const;
 
   bool UsingSharedMemoryResources();
   int id() const { return tree_id_; }
 
   bool ScheduleMicroBenchmark(const std::string& benchmark_name,
                               scoped_ptr<base::Value> value,
                               const MicroBenchmark::DoneCallback& callback);
 
+  // Call this function when you expect there to be a swap buffer and want to
+  // have something done when the swap buffer actaully happens. Provide a
+  // did_swap_callback in the SwapPromise to be called when swap buffer happens,

[jamesr, 2013/11/12 03:15:04]

what thread will these callbacks be invoked on?

[Yufeng Shen (Slow to review), 2013/11/13 21:05:04]

Please see the comments in thread_proxy.cc

+  // and a swap_aborted_callback to be called when the swap buffer is aborted (

[jamesr, 2013/11/12 03:15:04]

what about when the context is lost? see
LayerTreeHostClient::DidInitializeOutputSurface()

[Yufeng Shen (Slow to review), 2013/11/13 21:05:04]

We started an email thread "Swap Promises" discussing this.

+  // e.g. the next commit aborts, the next frame generated does not have actual
+  // damage).
+  void QueueSwapPromise(const SwapPromise& swap_promise);
+
+  bool HasQueuedSwapPromise();
+  void FinishSwapPromise();
+  void BreakSwapPromise(const std::string& msg);
+
  protected:
   LayerTreeHost(LayerTreeHostClient* client,
                 SharedBitmapManager* manager,
                 const LayerTreeSettings& settings);
   bool Initialize(scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
   bool InitializeForTesting(scoped_ptr<Proxy> proxy_for_testing);
   void SetOutputSurfaceLostForTesting(bool is_lost) {
     output_surface_lost_ = is_lost;
   }
 
@@ skipping 126 matching lines @@
   LCDTextMetrics lcd_text_metrics_;
   int tree_id_;
   bool next_commit_forces_redraw_;
 
   scoped_refptr<Layer> page_scale_layer_;
   scoped_refptr<Layer> inner_viewport_scroll_layer_;
   scoped_refptr<Layer> outer_viewport_scroll_layer_;
 
   SharedBitmapManager* shared_bitmap_manager_;
 
+  std::vector<SwapPromise> swap_promise_list_;
+
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_