cc: Make UI resources use raster color space

UI resources are rastered in sRGB, if the screen
has a different color space, a color conversion step
will be added to the fragment shader.

This CL creates UI resources directly in the color space
used by the final compositing step, so that
the conversion can be skipped.

Bug: 1129243
Change-Id: Ia9659cbb993ebb16097079daf6c7e67aecf0525f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441932
Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814330}

cc/trees/layer_tree_host_impl.cc

@@ -4242,8 +4242,9 @@ void LayerTreeHostImpl::CreateUIResource(UIResourceId uid,
   const gfx::Size source_size = bitmap.GetSize();
   gfx::Size upload_size = bitmap.GetSize();
   bool scaled = false;
-  // UIResources are assumed to be rastered in SRGB.
-  const gfx::ColorSpace& color_space = gfx::ColorSpace::CreateSRGB();
+  // UIResources are assumed to be rastered in raster color space.
+  const gfx::ColorSpace& color_space =
+      GetRasterColorSpace(gfx::ContentColorUsage::kSRGB);
 
   if (source_size.width() > max_texture_size_ ||
       source_size.height() > max_texture_size_) {