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

cc/paint/discardable_image_map.cc

Index: cc/paint/discardable_image_map.cc
diff --git a/cc/paint/discardable_image_map.cc b/cc/paint/discardable_image_map.cc
index fa45b242aa00ada2784471df82286d4d3cfc288a..7bc1219a09c18d7d722f82a526695689d7dbbca7 100644
--- a/cc/paint/discardable_image_map.cc
+++ b/cc/paint/discardable_image_map.cc
@@ -30,6 +30,14 @@ void DiscardableImageMap::EndGeneratingMetadata() {
                       [](const std::pair<DrawImage, gfx::Rect>& image) {
                         return image.second;
                       });
+  for (const auto& image_rect_pair : all_images_) {

[vmpstr, 2017/05/09 22:58:27]

You can just pass &has_non_srgb_images_ to DiscardableImageStore ctor (like we
do with all_images_) and set it whenever we find an image. That saves an extra
pass through the images.  

+    const DrawImage& draw_image = image_rect_pair.first;
+    SkColorSpace* color_space = draw_image.image()->colorSpace();
+    if (color_space && !color_space->isSRGB()) {
+      has_non_srgb_images_ = true;
+      break;
+    }
+  }
 }
 
 void DiscardableImageMap::GetDiscardableImagesInRect(