Mac Overlays: Add AllOrNothing strategy

cc/output/overlay_strategy_all_or_nothing.h

+// Copyright 2015 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_OUTPUT_OVERLAY_STRATEGY_ALL_OR_NOTHING_H_
+#define CC_OUTPUT_OVERLAY_STRATEGY_ALL_OR_NOTHING_H_
+
+#include "cc/output/overlay_processor.h"
+
+namespace cc {
+
+class OverlayCandidateValidator;
+
+// This strategy attempts to promote all quads into overlays.
+// If any quad can't be promoted, it returns false and no quads are promoted.
+class CC_EXPORT OverlayStrategyAllOrNothing
+    : public OverlayProcessor::Strategy {
+ public:
+  explicit OverlayStrategyAllOrNothing(
+      OverlayCandidateValidator* capability_checker);
+  ~OverlayStrategyAllOrNothing() override;
+
+  bool Attempt(RenderPassList* render_passes,
+               OverlayCandidateList* candidate_list,
+               float device_scale_factor) override;
+
+ private:
+  OverlayCandidateValidator* capability_checker_;  // Weak.
+
+  DISALLOW_COPY_AND_ASSIGN(OverlayStrategyAllOrNothing);
+};
+
+}  // namespace cc
+
+#endif  // CC_OUTPUT_OVERLAY_STRATEGY_ALL_OR_NOTHING_H_