Adds support for hittesting points on surface quads

cc/surfaces/surface_hittest.h

Index: cc/surfaces/surface_hittest.h
diff --git a/cc/surfaces/surface_hittest.h b/cc/surfaces/surface_hittest.h
new file mode 100644
index 0000000000000000000000000000000000000000..e7d13f25608f1482ba38f701ab8c6489ed54ff39
--- /dev/null
+++ b/cc/surfaces/surface_hittest.h
@@ -0,0 +1,45 @@
+// 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_SURFACES_SURFACE_HITTEST_H_
+#define CC_SURFACES_SURFACE_HITTEST_H_
+
+#include <set>
+
+#include "cc/surfaces/surface_id.h"
+#include "cc/surfaces/surfaces_export.h"
+
+namespace gfx {
+class Point;
+}
+
+namespace cc {
+class RenderPass;
+class SurfaceManager;
+
+// Performs a hittest in surface quads.
+class CC_SURFACES_EXPORT SurfaceHittest {
+ public:
+  explicit SurfaceHittest(SurfaceManager* manager);
+  ~SurfaceHittest();
+
+  // Hittests against Surface with SurfaceId |surface_id|, return the contained
+  // surface that the point is hitting and the |transformed_point| in the
+  // surface space.
+  SurfaceId Hittest(SurfaceId surface_id,
+                    const gfx::Point& point,
+                    gfx::Point* transformed_point);
+
+ private:
+  SurfaceId HittestInternal(SurfaceId surface_id,
+                            const RenderPass* render_pass,
+                            const gfx::Point& point,
+                            gfx::Point* out_transformed_point);
+
+  SurfaceManager* const manager_;
+  std::set<SurfaceId> referenced_surfaces_;
+};
+}  // namespace cc
+
+#endif  // CC_SURFACES_SURFACE_HITTEST_H_