[WIP] cc: Use sRGB for rastering non-wide-color-gamut content

cc/paint/discardable_image_map.h

Index: cc/paint/discardable_image_map.h
diff --git a/cc/paint/discardable_image_map.h b/cc/paint/discardable_image_map.h
index 881698fdac797f4b7f36ae3153f66697ac7170d5..9b7ed3e6b0c304f3af369ff4d8f692ec289d75aa 100644
--- a/cc/paint/discardable_image_map.h
+++ b/cc/paint/discardable_image_map.h
@@ -45,6 +45,7 @@ class CC_PAINT_EXPORT DiscardableImageMap {
   ~DiscardableImageMap();
 
   bool empty() const { return all_images_.empty(); }
+  bool has_non_srgb_images() const { return has_non_srgb_images_; }
   void GetDiscardableImagesInRect(const gfx::Rect& rect,
                                   float contents_scale,
                                   const gfx::ColorSpace& target_color_space,
@@ -61,6 +62,7 @@ class CC_PAINT_EXPORT DiscardableImageMap {
 
   std::vector<std::pair<DrawImage, gfx::Rect>> all_images_;
   base::flat_map<ImageId, gfx::Rect> image_id_to_rect_;
+  bool has_non_srgb_images_ = false;
 
   RTree images_rtree_;
 };