Implement HitTestAggregator

services/viz/hit_test/public/interfaces/hit_test_data.mojom

Index: services/viz/hit_test/public/interfaces/hit_test_data.mojom
diff --git a/services/viz/hit_test/public/interfaces/hit_test_data.mojom b/services/viz/hit_test/public/interfaces/hit_test_data.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..bc2c2a557c78806606822c47f2b6bbbca8aeb750
--- /dev/null
+++ b/services/viz/hit_test/public/interfaces/hit_test_data.mojom
@@ -0,0 +1,60 @@
+// 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.
+
+module viz.hit_test.mojom;
+
+import "cc/ipc/surface_id.mojom";
+import "ui/gfx/geometry/mojo/geometry.mojom";
+import "ui/gfx/mojo/transform.mojom";
+
+// Region maps to this surface ( me ).
+const uint32 kHitTestMine = 0x01;
+
+// Region ignored for hit testing ( transparent backgrounds & hover:none ).
+const uint32 kHitTestIgnore = 0x02;
+
+// Region maps to child surface ( OOPIF ).
+const uint32 kHitTestChildSurface = 0x04;
+
+// Irregular boundary - send HitTestRequest to resolve.
+const uint32 kHitTestAsk = 0x08;
+
+// No touch event handler exists - no need to send touch events.
+const uint32 kHitTestNoTouchEventHandler = 0x10;
+
+struct HitTestRegion {
+
+    // Flags to indicate the type of HitTestRegion.

[varkha, 2017/06/20 19:56:59]

nit: tabulation.

[gklassen, 2017/06/26 21:55:20]

Done.

+    uint32 flags;
+
+    // SurfaceId is required when flags = kHitTestChildSurface.
+    cc.mojom.SurfaceId surface_id;
+
+    // The rect of the region in the coordinate space of the embedder.
+    gfx.mojom.Rect rect;
+
+    // The transform applied to the child region.
+    gfx.mojom.Transform transform;
+};
+
+struct HitTestData {
+
+  // SurfaceId corresponding to this HitTestData.
+  cc.mojom.SurfaceId surface_id;
+
+  // Flags indicate how to handle events that match no sub-regions.
+  // kHitTestMine routes un-matched events to this surface ( opaque ).
+  // kHitTestIgnore keeps previous match in the parent ( transparent ).
+  uint32 flags;
+
+  // The bounds of the surface.
+  gfx.mojom.Rect bounds;
+
+  // The transform that applies to all regions in this surface.
+  gfx.mojom.Transform transform;
+
+  // The list of sub-regions in front to back order.
+  //TODO(gklassen): invert order if its easier to write them back to front.

[varkha, 2017/06/20 19:56:59]

nit: space after //, its -> it's

[gklassen, 2017/06/26 21:55:20]

Done.

+  array<HitTestRegion> regions;
+};