Mozart: Implement hit testing.

services/gfx/compositor/graph/scene_content.cc

Index: services/gfx/compositor/graph/scene_content.cc
diff --git a/services/gfx/compositor/graph/scene_content.cc b/services/gfx/compositor/graph/scene_content.cc
index ad4fcf464993442315a64794ab623efba44e0a56..7d76309f2956a64eb085b4686080e3603a6f7abc 100644
--- a/services/gfx/compositor/graph/scene_content.cc
+++ b/services/gfx/compositor/graph/scene_content.cc
@@ -22,6 +22,36 @@ SceneContent::SceneContent(const SceneLabel& label,
 
 SceneContent::~SceneContent() {}
 
+void SceneContent::RecordPicture(const Snapshot* snapshot,
+                                 SkCanvas* canvas) const {
+  const NodeDef* root = GetRootNodeIfExists();
+  if (root)
+    root->RecordPicture(this, snapshot, canvas);
+}
+
+mojo::gfx::composition::SceneHitPtr SceneContent::HitTest(
+    const Snapshot* snapshot,
+    const SkPoint& global_point,
+    const SkMatrix& scene_transform,
+    bool* opaque) const {
+  DCHECK(snapshot);
+  DCHECK(opaque);
+
+  mojo::Array<mojo::gfx::composition::HitPtr> hits;
+  const NodeDef* root = GetRootNodeIfExists();
+  if (root)
+    root->HitTest(this, snapshot, global_point, scene_transform, opaque, &hits);
+  if (!hits.size())
+    return nullptr;
+
+  auto scene_hit = mojo::gfx::composition::SceneHit::New();
+  scene_hit->scene_token = mojo::gfx::composition::SceneToken::New();
+  scene_hit->scene_token->value = label_.token();
+  scene_hit->scene_version = version_;
+  scene_hit->hits = hits.Pass();
+  return scene_hit.Pass();
+}
+
 const ResourceDef* SceneContent::GetResource(
     uint32_t resource_id,
     ResourceDef::Type resource_type) const {