Refactor VR Shell Input. Locks input to click/scroll targets.

chrome/browser/android/vr_shell/textures/ui_texture.cc

Index: chrome/browser/android/vr_shell/textures/ui_texture.cc
diff --git a/chrome/browser/android/vr_shell/textures/ui_texture.cc b/chrome/browser/android/vr_shell/textures/ui_texture.cc
index 4c68b42b6b057299a96ff3cf5d60b91d913f5536..f45e73094e01dcab2d74f82cebd8d29f60e6d68d 100644
--- a/chrome/browser/android/vr_shell/textures/ui_texture.cc
+++ b/chrome/browser/android/vr_shell/textures/ui_texture.cc
@@ -31,6 +31,13 @@ UiTexture::UiTexture() = default;
 
 UiTexture::~UiTexture() = default;
 
+bool UiTexture::Update(int draw_flags) {
+  if (draw_flags == draw_flags_)
+    return false;
+  draw_flags_ = draw_flags;
+  return true;
+}
+
 void UiTexture::DrawAndLayout(SkCanvas* canvas, const gfx::Size& texture_size) {
   canvas->drawColor(SK_ColorTRANSPARENT);
   Draw(canvas, texture_size);