Start of hardware overlay support in CC with Ubercompositor.

cc/output/overlay_processor.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/output/overlay_processor.h"
+
+#include "cc/output/output_surface.h"
+#include "cc/output/overlay_strategy_single_on_top.h"
+#include "cc/quads/draw_quad.h"
+#include "cc/quads/texture_draw_quad.h"
+#include "ui/gfx/rect_conversions.h"
+#include "ui/gfx/transform.h"
+
+namespace cc {
+
+OverlayProcessor::OverlayProcessor(OutputSurface* surface,
+                                   ResourceProvider* resource_provider)
+    : surface_(surface), resource_provider_(resource_provider) {}
+
+void OverlayProcessor::Initialize() {
+  DCHECK(surface_);
+  DCHECK(resource_provider_);
+  OverlayCandidateValidator* candidates =
+      surface_->overlay_candidate_validator();
+  if (candidates) {
+    strategies_.push_back(scoped_ptr<Strategy>(
+        new OverlayStrategySingleOnTop(candidates, resource_provider_)));
+  }
+}
+
+OverlayProcessor::~OverlayProcessor() {}
+
+void OverlayProcessor::ProcessForOverlays(
+    RenderPassList* render_passes_in_draw_order) {
+  for (StrategyList::iterator it = strategies_.begin(); it != strategies_.end();
+       ++it) {
+    if ((*it)->Attempt(render_passes_in_draw_order))
+      return;
+  }
+}
+
+}  // namespace cc