Color: Add cc accessors and unit tests

cc/resources/resource_provider.cc

Index: cc/resources/resource_provider.cc
diff --git a/cc/resources/resource_provider.cc b/cc/resources/resource_provider.cc
index 6ab684647b076a63d5a5ed3e3a343c6cc54de34c..ce9b233b6790206c69a9374a594bb0eaa79c9d95 100644
--- a/cc/resources/resource_provider.cc
+++ b/cc/resources/resource_provider.cc
@@ -668,6 +668,7 @@ ResourceId ResourceProvider::CreateResourceFromTextureMailbox(
                  base::Owned(release_callback_impl.release()));
   resource->read_lock_fences_enabled = read_lock_fences_enabled;
   resource->is_overlay_candidate = mailbox.is_overlay_candidate();
+  resource->color_space = mailbox.color_space();
 
   return id;
 }
@@ -1031,6 +1032,7 @@ ResourceProvider::ScopedReadLockGL::ScopedReadLockGL(
   texture_id_ = resource->gl_id;
   target_ = resource->target;
   size_ = resource->size;
+  color_space_ = resource->color_space;
 }
 
 ResourceProvider::ScopedReadLockGL::~ScopedReadLockGL() {