Add way to get native VR UI information from Java

chrome/browser/android/vr_shell/vr_shell_gl.cc

Index: chrome/browser/android/vr_shell/vr_shell_gl.cc
diff --git a/chrome/browser/android/vr_shell/vr_shell_gl.cc b/chrome/browser/android/vr_shell/vr_shell_gl.cc
index 587c233fa5b55a6d3916c2c89d31676ba5df54af..3f23cb4bfe515d7031514f2145f74b3e5cca9506 100644
--- a/chrome/browser/android/vr_shell/vr_shell_gl.cc
+++ b/chrome/browser/android/vr_shell/vr_shell_gl.cc
@@ -339,6 +339,22 @@ void VrShellGl::SetSubmitClient(
   submit_client_.Bind(std::move(submit_client_info));
 }
 
+void VrShellGl::CreateUiElementInfos(
+    std::vector<int> element_ids,
+    int callback_id,
+    base::Callback<void(int, std::unique_ptr<base::DictionaryValue>)>
+        onCreate) {

[tiborg, 2017/03/27 15:14:33]

Nit: I think we generally follow the convention to use underbars as spaces for
parameter names. So, onCreate -> on_created.

[bsheedy, 2017/03/27 17:49:09]

Done.

+  std::unique_ptr<base::DictionaryValue> reply =
+      base::MakeUnique<base::DictionaryValue>();
+  for (unsigned int i = 0; i < element_ids.size(); i++) {
+    reply->Set(std::to_string(element_ids[i]),
+               std::move(scene_->CreateUiElementInfo(element_ids[i])));
+  }
+  main_thread_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(onCreate, callback_id, base::Passed(std::move(reply))));
+}
+
 void VrShellGl::OnUIFrameAvailable() {
   ui_surface_texture_->UpdateTexImage();
 }