Plumb a Browser->GPU surface destruction message for Android VDAs

content/common/gpu/media/avda_surface_tracker.cc

+// Copyright 2016 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/common/gpu/media/avda_surface_tracker.h"
+
+#include "base/lazy_instance.h"
+#include "base/logging.h"
+#include "base/observer_list.h"
+#include "content/common/gpu/media/android_video_decode_accelerator.h"
+#include "gpu/ipc/common/gpu_surface_lookup.h"
+
+namespace content {
+
+namespace {
+static base::LazyInstance<AVDASurfaceTracker>::Leaky g_lazy_instance =

[no sievers, 2016/04/19 23:30:17]

nit: doesn't have to be Leaky

[watk, 2016/04/22 02:48:55]

Done.

+    LAZY_INSTANCE_INITIALIZER;
+}
+
+AVDASurfaceTracker::AVDASurfaceTracker() {}
+
+AVDASurfaceTracker::~AVDASurfaceTracker() {}
+
+AVDASurfaceTracker* AVDASurfaceTracker::GetInstance() {
+  return g_lazy_instance.Pointer();
+}
+
+void AVDASurfaceTracker::AddSurfaceDestructionObserver(
+    SurfaceDestructionObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void AVDASurfaceTracker::RemoveSurfaceDestructionObserver(
+    SurfaceDestructionObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void AVDASurfaceTracker::NotifyDestroyingSurface(int surface_id) {
+  FOR_EACH_OBSERVER(SurfaceDestructionObserver, observers_,
+                    OnDestroyingSurface(surface_id));
+}
+
+}  // namespace content