Reland of Enable promotion of RenderPassDrawQuads to CALayers.

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 dabfc1ee5b27f7fab4ea77ff912ad67feb1e7f76..8c06814e44a6e41e3c01cfe3ab420f2ac909e73d 100644
--- a/cc/output/ca_layer_overlay.cc
+++ b/cc/output/ca_layer_overlay.cc
@@ -16,8 +16,6 @@
 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.
@@ -84,11 +82,7 @@
   ca_layer_overlay->rpdq = quad;
   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,
@@ -304,8 +298,4 @@
   return true;
 }
 
-void EnableRenderPassDrawQuadForTesting() {
-  g_allow_rpdq_quad_conversion = true;
-}
-
 }  // namespace cc