WIP Hittest Component.

components/viz/hittest/hittest.h

Index: components/viz/hittest/hittest.h
diff --git a/components/viz/hittest/hittest.h b/components/viz/hittest/hittest.h
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+++ b/components/viz/hittest/hittest.h
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+// 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 COMPONENTS_VIZ_HITTEST_HITTEST_H_
+#define COMPONENTS_VIZ_HITTEST_HITTEST_H_
+
+#include <stdint.h>
+
+#include <map>
+#include <memory>
+
+#include "cc/output/compositor_frame.h"
+#include "cc/surfaces/surface_id.h"
+#include "components/viz/hittest/hittest_export.h"
+#include "components/viz/hittest/public/interfaces/hittest_data.mojom.h"
+#include "ui/gfx/geometry/quad_f.h"
+
+namespace viz {
+
+// Hittest
+// Maintains maping between display regions and associated surfaces
+// in shared memory to enable efficient hit testing across processes.
+//
+// This is intended to be created in the viz or GPU process. For mus+ash this
+// will be true after the mus process split.
+
+class HITTEST_EXPORT Hittest {
+ public:
+  static cc::SurfaceId SurfaceIdAtPoint(cc::SurfaceId root_surface_id,
+                                        const gfx::Point& point,
+                                        gfx::Point* transformed_point) {
+    return GetInstance()->InternalGetSurfaceIdAtPoint(root_surface_id, point,
+                                                      transformed_point);
+  }
+
+  static void DisplayWillDrawAndSwap(bool will_draw_and_swap,
+                                     const cc::RenderPassList& render_passes) {
+    GetInstance()->Aggregate();
+  }
+
+ private:
+  static Hittest* instance_;
+
+  static Hittest* GetInstance() {
+    if (instance_ == NULL) {
+      instance_ = new Hittest();
+    }
+    return instance_;
+  }
+
+  Hittest();
+  ~Hittest();
+
+  std::map<cc::SurfaceId, hittest::mojom::HittestData> pending_;
+
+  struct Region;
+  std::vector<Region> regions_[2];
+  std::vector<Region>* current_regions_;
+
+  cc::SurfaceId InternalGetSurfaceIdAtPoint(cc::SurfaceId root_surface_id,
+                                            const gfx::Point& point,
+                                            gfx::Point* transformed_point);
+
+  void SubmitHittestData(const hittest::mojom::HittestData& hittest_data);
+
+  void Aggregate();
+
+  void swap();
+};
+
+}  // namespace viz
+
+#endif  //  COMPONENTS_VIZ_HITTEST_HITTEST_H_