[vr] Add incognito coloring

chrome/browser/android/vr_shell/ui_scene.h

Index: chrome/browser/android/vr_shell/ui_scene.h
diff --git a/chrome/browser/android/vr_shell/ui_scene.h b/chrome/browser/android/vr_shell/ui_scene.h
index 119fec7041dcf33c9df0bf69e05f7bc5ad355d49..e12cf63cbaaadd45f95b62d339402fdae0204ede 100644
--- a/chrome/browser/android/vr_shell/ui_scene.h
+++ b/chrome/browser/android/vr_shell/ui_scene.h
@@ -10,6 +10,7 @@
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "chrome/browser/android/vr_shell/color_scheme.h"
 #include "chrome/browser/android/vr_shell/ui_elements/ui_element_debug_id.h"
 #include "third_party/skia/include/core/SkColor.h"
 
@@ -66,8 +67,11 @@ class UiScene {
   std::vector<const UiElement*> GetHeadLockedElements() const;
   bool HasVisibleHeadLockedElements() const;
 
-  void SetBackgroundColor(const SkColor& color);
-  const SkColor& GetBackgroundColor() const;
+  void SetMode(ColorScheme::Mode mode);
+  ColorScheme::Mode mode() const;
+
+  SkColor GetBackgroundColor() const;
+
   void SetBackgroundDistance(float distance);

[amp, 2017/05/27 00:47:47]

I think there is some overlap with the word 'background' now.

Perhaps we should change the non-text background to be something like
'environment'?

[Ian Vollick, 2017/05/27 01:29:12]

Hmm. Perhaps we should change the others to text_background and text_foreground?

It'd be good to discuss some possible names next week.

   float GetBackgroundDistance() const;
 
@@ -85,7 +89,8 @@ class UiScene {
 
   std::vector<std::unique_ptr<UiElement>> ui_elements_;
   UiElement* content_element_ = nullptr;
-  SkColor background_color_ = 0xFF1A1A1A;
+  ColorScheme::Mode mode_ = ColorScheme::kModeNormal;
+
   float background_distance_ = 10.0f;
   bool webvr_rendering_enabled_ = true;
   bool gl_initialized_ = false;