VR: Split off UI code into a library to ease future unit testing.

chrome/browser/android/vr_shell/vr_shell_renderer.cc

Index: chrome/browser/android/vr_shell/vr_shell_renderer.cc
diff --git a/chrome/browser/android/vr_shell/vr_shell_renderer.cc b/chrome/browser/android/vr_shell/vr_shell_renderer.cc
index 1390d68971842b49720efd4e499a5785ca175cb0..d5d3c862660d959d7e2b2a3befd62820dce558df 100644
--- a/chrome/browser/android/vr_shell/vr_shell_renderer.cc
+++ b/chrome/browser/android/vr_shell/vr_shell_renderer.cc
@@ -817,6 +817,22 @@ VrShellRenderer::VrShellRenderer()
 
 VrShellRenderer::~VrShellRenderer() = default;
 
+void VrShellRenderer::DrawTexturedQuad(int texture_data_handle,
+                                       const vr::Mat4f& view_proj_matrix,
+                                       const gfx::RectF& copy_rect,
+                                       float opacity) {
+  GetTexturedQuadRenderer()->AddQuad(texture_data_handle, view_proj_matrix,
+                                     copy_rect, opacity);
+}
+
+void VrShellRenderer::DrawGradientQuad(const vr::Mat4f& view_proj_matrix,
+                                       const SkColor edge_color,
+                                       const SkColor center_color,
+                                       float opacity) {
+  GetGradientQuadRenderer()->Draw(view_proj_matrix, edge_color, center_color,
+                                  opacity);
+}
+
 ExternalTexturedQuadRenderer*
 VrShellRenderer::GetExternalTexturedQuadRenderer() {
   Flush();