Monitor the system native frame color on Win 10.

chrome/browser/themes/theme_service.h

Index: chrome/browser/themes/theme_service.h
diff --git a/chrome/browser/themes/theme_service.h b/chrome/browser/themes/theme_service.h
index 9eea41a91dca4aaa9516de321f3ad319815bc8bb..7f4cf1e8f074ada397a488bab476f4f03260a51f 100644
--- a/chrome/browser/themes/theme_service.h
+++ b/chrome/browser/themes/theme_service.h
@@ -136,6 +136,10 @@ class ThemeService : public base::NonThreadSafe,
   // Returns true if the ThemeService should use the system theme on startup.
   virtual bool ShouldInitWithSystemTheme() const;
 
+  // Returns the color to use for |id| and |incognito| if the theme service does
+  // not provide an override.
+  virtual SkColor GetDefaultColor(int id, bool incognito) const;
+
   // Get the specified tint - |id| is one of the TINT_* enum values.
   color_utils::HSL GetTint(int id, bool incognito) const;
 
@@ -157,6 +161,11 @@ class ThemeService : public base::NonThreadSafe,
   // from ClearAllThemeData().
   virtual void FreePlatformCaches();
 
+  // Implementation for ui::ThemeProvider (see block of functions in private
+  // section).
+  virtual bool ShouldUseNativeFrame() const;
+  bool HasCustomImage(int id) const;
+
   Profile* profile() const { return profile_; }
 
   void set_ready() { ready_ = true; }
@@ -211,8 +220,6 @@ class ThemeService : public base::NonThreadSafe,
   gfx::ImageSkia* GetImageSkiaNamed(int id, bool incognito) const;
   SkColor GetColor(int id, bool incognito) const;
   int GetDisplayProperty(int id) const;
-  bool ShouldUseNativeFrame() const;
-  bool HasCustomImage(int id) const;
   base::RefCountedMemory* GetRawData(int id,
                                      ui::ScaleFactor scale_factor) const;
 #if defined(OS_MACOSX)