mus: Implement Window Server Capture

components/mus/view_tree_apptest.cc

Index: components/mus/view_tree_apptest.cc
diff --git a/components/mus/view_tree_apptest.cc b/components/mus/view_tree_apptest.cc
index dfef44ec5589e3de604abe610619240898aa6d7a..7f7a5129570f68f9c1934bb175461eb4b628931b 100644
--- a/components/mus/view_tree_apptest.cc
+++ b/components/mus/view_tree_apptest.cc
@@ -162,6 +162,14 @@ bool DeleteView(ViewTree* vm, Id view_id) {
   return result;
 }
 
+bool SetViewCapture(ViewTree* vm, Id view_id) {
+  base::RunLoop run_loop;
+  bool result = false;
+  vm->SetCapture(view_id, base::Bind(&BoolResultCallback, &run_loop, &result));
+  run_loop.Run();
+  return result;
+}
+
 bool SetViewBounds(ViewTree* vm, Id view_id, int x, int y, int w, int h) {
   base::RunLoop run_loop;
   bool result = false;
@@ -316,6 +324,7 @@ class TestViewTreeClientImpl : public mojo::ViewTreeClient,
     tracker()->OnEmbeddedAppDisconnected(view_id);
   }
   void OnUnembed() override { tracker()->OnUnembed(); }
+  void OnLostCapture(Id view_id) override { tracker()->OnLostCapture(view_id); }
   void OnViewBoundsChanged(Id view_id,
                            RectPtr old_bounds,
                            RectPtr new_bounds) override {
@@ -1667,6 +1676,22 @@ TEST_F(ViewTreeAppTest, CantEmbedFromConnectionRoot) {
       EmbedUrl(application_impl(), vm3(), application_impl()->url(), view_1_2));
 }
 
+TEST_F(ViewTreeAppTest, CapturePropagation) {
+  Id view_1_1 = vm_client1()->CreateView(1);
+  Id view_1_2 = vm_client1()->CreateView(2);
+  changes1()->clear();
+  // View 1 takes capture then View 2 takes capture.
+  // Verify that view 1 has lost capture.
+  SetViewCapture(vm1(), view_1_1);
+  SetViewCapture(vm1(), view_1_2);

[sadrul, 2015/09/18 01:30:50]

What if the two setcapture calls come from two separate clients?

[Fady Samuel, 2015/09/18 02:44:43]

So two separate windows? If one tries to capture, the OS will release capture
for the other, right? I'm not sure how to test that.

[sadrul, 2015/09/18 11:47:28]

Yep. (in most cases anyway. The second capture can be declined in some cases)

I meant for the case where an embedder and an oopif both do SetCapture (i.e.
different tree-clients within the same host) one after the other.

+  vm_client1_->WaitForChangeCount(1);
+
+  EXPECT_EQ("OnLostCapture view=" + IdToString(view_1_1),
+            SingleChangeToDescription(*changes1()));
+  // std::vector<TestView> views;
+  // GetViewTree(vm1(), view_1_1, &views);
+  // EXPECT_FALSE(views.empty());
+}

[sadrul, 2015/09/18 01:30:50]

?

[Fady Samuel, 2015/09/18 02:44:43]

Removed.

 // TODO(sky): need to better track changes to initial connection. For example,
 // that SetBounsdViews/AddView and the like don't result in messages to the
 // originating connection.