Add way to get native VR UI information from Java

chrome/browser/android/vr_shell/vr_shell_gl.cc

 // Copyright 2016 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.
 
 #include "chrome/browser/android/vr_shell/vr_shell_gl.h"
 
 #include <limits>
 #include <utility>
 
 #include "base/android/jni_android.h"
@@ skipping 321 matching lines @@
   // of the native GL context to avoid stalls later in GVR frame
   // acquire/submit.
   glFinish();
 }
 
 void VrShellGl::SetSubmitClient(
     device::mojom::VRSubmitFrameClientPtrInfo submit_client_info) {
   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();
 }
 
 void VrShellGl::OnContentFrameAvailable() {
   content_surface_texture_->UpdateTexImage();
   received_frame_ = true;
 }
 
 void VrShellGl::OnWebVRFrameAvailable() {
@@ skipping 938 matching lines @@
   // appropriate recommended render resolution as the default size during
   // InitializeGl. Revisit if the initialization order changes.
   device::mojom::VRDisplayInfoPtr info = VrShell::CreateVRDisplayInfo(
       gvr_api_.get(), webvr_surface_size_, device_id);
   main_thread_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&RunVRDisplayInfoCallback, callback, base::Passed(&info)));
 }
 
 }  // namespace vr_shell