Never call GraphicsLayer::paint when fetching painted output from cc.

cc/blink/web_content_layer_impl.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/blink/web_content_layer_impl.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "cc/base/switches.h"
@@ skipping 16 matching lines @@
       cc::switches::kDisableCachedPictureRaster);
   return use;
 }
 
 static blink::WebContentLayerClient::PaintingControlSetting
 PaintingControlToWeb(
     cc::ContentLayerClient::PaintingControlSetting painting_control) {
   switch (painting_control) {
     case cc::ContentLayerClient::PAINTING_BEHAVIOR_NORMAL:
       return blink::WebContentLayerClient::PaintDefaultBehavior;
+    case cc::ContentLayerClient::PAINTING_BEHAVIOR_NORMAL_FOR_TEST:
+      return blink::WebContentLayerClient::PaintDefaultBehaviorForTest;
     case cc::ContentLayerClient::DISPLAY_LIST_CONSTRUCTION_DISABLED:
       return blink::WebContentLayerClient::DisplayListConstructionDisabled;
     case cc::ContentLayerClient::DISPLAY_LIST_CACHING_DISABLED:
       return blink::WebContentLayerClient::DisplayListCachingDisabled;
     case cc::ContentLayerClient::DISPLAY_LIST_PAINTING_DISABLED:
       return blink::WebContentLayerClient::DisplayListPaintingDisabled;
     case cc::ContentLayerClient::SUBSEQUENCE_CACHING_DISABLED:
       return blink::WebContentLayerClient::SubsequenceCachingDisabled;
   }
   NOTREACHED();
@@ skipping 37 matching lines @@
 
 bool WebContentLayerImpl::FillsBoundsCompletely() const {
   return false;
 }
 
 size_t WebContentLayerImpl::GetApproximateUnsharedMemoryUsage() const {
   return client_->approximateUnsharedMemoryUsage();
 }
 
 }  // namespace cc_blink