Refactor GvrDelegate ownership into GvrDelegateProvider and fix more threading violations.

chrome/browser/android/vr_shell/vr_shell_gl.h

Index: chrome/browser/android/vr_shell/vr_shell_gl.h
diff --git a/chrome/browser/android/vr_shell/vr_shell_gl.h b/chrome/browser/android/vr_shell/vr_shell_gl.h
index bf285671ccc5354b13fb01dcf2f410ca000b1aa2..076ebc0af60a261cb96593c70a257410c592b2db 100644
--- a/chrome/browser/android/vr_shell/vr_shell_gl.h
+++ b/chrome/browser/android/vr_shell/vr_shell_gl.h
@@ -83,7 +83,6 @@ class VrShellGl : public device::mojom::VRVSyncProvider {
   void UpdateWebVRTextureBounds(int16_t frame_index,
                                 const gvr::Rectf& left_bounds,
                                 const gvr::Rectf& right_bounds);
-  gvr::GvrApi* gvr_api();
   void SetGvrPoseForWebVr(const gvr::Mat4f& pose, uint32_t pose_num);
   gvr::Sizei GetWebVRCompositorSurfaceSize();
 
@@ -92,6 +91,10 @@ class VrShellGl : public device::mojom::VRVSyncProvider {
   void UpdateVSyncInterval(long timebase_nanos, double interval_seconds);
 
   void OnRequest(device::mojom::VRVSyncProviderRequest request);
+  void ResetPose();
+  void CreateVRDisplayInfo(
+      const base::Callback<void(device::mojom::VRDisplayInfoPtr)>& callback,
+      uint32_t device_id);
 
  private:
   void GvrInit(gvr_context* gvr_api);