Change chrome:// favicons in tabstrip based on theming.

ui/base/theme_provider.h

Index: ui/base/theme_provider.h
diff --git a/ui/base/theme_provider.h b/ui/base/theme_provider.h
index fb10db6f37e6f1734954fdc49422dc6df5123297..ba9017a671d312083711bfca02b79236d9745192 100644
--- a/ui/base/theme_provider.h
+++ b/ui/base/theme_provider.h
@@ -28,6 +28,10 @@ namespace base {
 class RefCountedMemory;
 }
 
+namespace color_utils {
+struct HSL;
+}
+
 namespace gfx {
 class ImageSkia;
 }
@@ -54,6 +58,9 @@ class UI_BASE_EXPORT ThemeProvider {
   // Get the color specified by |id|.
   virtual SkColor GetColor(int id) const = 0;
 
+  // Get the HSL shift specified by |id|.
+  virtual color_utils::HSL GetTint(int id) const = 0;
+
   // Get the property (e.g. an alignment expressed in an enum, or a width or
   // height) specified by |id|.
   virtual int GetDisplayProperty(int id) const = 0;