Enable RenderPassDrawQuad promotion to CALayer.

cc/output/ca_layer_overlay.cc

Index: cc/output/ca_layer_overlay.cc
diff --git a/cc/output/ca_layer_overlay.cc b/cc/output/ca_layer_overlay.cc
index 8d4deb12ab2a90e3c8416500cd3e06a3d6fada6f..8117a682d844534237aba51151e47a6930fb0d63 100644
--- a/cc/output/ca_layer_overlay.cc
+++ b/cc/output/ca_layer_overlay.cc
@@ -17,8 +17,6 @@ namespace cc {
 
 namespace {
 
-bool g_allow_rpdq_quad_conversion = false;
-
 // This enum is used for histogram states and should only have new values added
 // to the end before COUNT.
 enum CALayerResult {
@@ -122,11 +120,7 @@ CALayerResult FromRenderPassQuad(ResourceProvider* resource_provider,
   ca_layer_overlay->render_pass_id = quad->render_pass_id;
   ca_layer_overlay->contents_rect = gfx::RectF(0, 0, 1, 1);
 
-  // TODO(erikchen): Enable this when RenderPassDrawQuad promotion to CALayer
-  // is fully functional. https://crbug.com/581526.
-  if (g_allow_rpdq_quad_conversion)
-    return CA_LAYER_SUCCESS;
-  return CA_LAYER_FAILED_RENDER_PASS;
+  return CA_LAYER_SUCCESS;
 }
 
 CALayerResult FromStreamVideoQuad(ResourceProvider* resource_provider,
@@ -342,8 +336,4 @@ bool ProcessForCALayerOverlays(ResourceProvider* resource_provider,
   return true;
 }
 
-void EnableRenderPassDrawQuadForTesting() {
-  g_allow_rpdq_quad_conversion = true;
-}
-
 }  // namespace cc