[vr] Add incognito coloring

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

 // Copyright 2017 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/textures/ui_texture.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 38 matching lines @@
   TRACE_EVENT0("gpu", "UiTexture::DrawAndLayout");
   canvas->drawColor(SK_ColorTRANSPARENT);
   dirty_ = false;
   Draw(canvas, texture_size);
 }
 
 bool UiTexture::HitTest(const gfx::PointF& point) const {
   return false;
 }
 
+void UiTexture::SetMode(ColorScheme::Mode mode) {
+  if (mode_ == mode)
+    return;
+  mode_ = mode;
+  OnSetMode();
+}
+
+void UiTexture::OnSetMode() {}
+
 std::vector<std::unique_ptr<gfx::RenderText>> UiTexture::PrepareDrawStringRect(
     const base::string16& text,
     const gfx::FontList& font_list,
     SkColor color,
     gfx::Rect* bounds,
     UiTexture::TextAlignment text_alignment,
     UiTexture::WrappingBehavior wrapping_behavior) {
   DCHECK(bounds);
 
   std::vector<std::unique_ptr<gfx::RenderText>> lines;
@@ skipping 118 matching lines @@
     fonts.push_back(gfx::Font(name, size));
   *font_list = gfx::FontList(fonts);
   return true;
 }
 
 void UiTexture::SetForceFontFallbackFailureForTesting(bool force) {
   force_font_fallback_failure_for_testing_ = force;
 }
 
 }  // namespace vr_shell