Add viz-host HitTestQuery.

components/viz/common/hit_test/display_hit_test_data.h

+// Copyright 2017 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_COMMON_HIT_TEST_DISPLAY_HIT_TEST_DATA_H_

[rjkroege, 2017/06/27 00:10:52]

flatten out the subdir. i.e. this goes in components/viz/common/* afaik.

[riajiang, 2017/06/27 15:51:44]

Done.

+#define COMPONENTS_VIZ_COMMON_HIT_TEST_DISPLAY_HIT_TEST_DATA_H_
+
+#include <vector>
+
+#include "cc/surfaces/frame_sink_id.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/transform.h"
+
+namespace viz {
+namespace hit_test {
+
+struct DisplayHitTestDataRegion {
+  cc::FrameSinkId id;
+  gfx::Rect bounds;
+  gfx::Transform transform;
+  uint32_t flags;
+  uint32_t child_count;
+};
+
+using DisplayHitTestData = std::vector<DisplayHitTestDataRegion>;

[sadrul, 2017/06/27 03:37:54]

If you follow the general convention in most chrome code, then I think this
should be DisplayHitTestDataRegionList. i.e.

  using DisplayHitTestRegionList = std::vector<DisplayHitTestDataRegion>;

(see, for example, cc::LayerList, cc::RenderPassList, ui::EventHandlerList etc.)

Although, I would go with DisplayHitTestData, and DisplayHitTestDataList.

[riajiang, 2017/06/27 15:51:44]

I see, changed to DisplayHitTestData and DisplayHitTestDataList

+
+}  // namespace hit_test
+}  // namespace viz
+
+#endif  // COMPONENTS_VIZ_COMMON_HIT_TEST_DISPLAY_HIT_TEST_DATA_H_