Use DrawingRecorder::canUseCachedDrawing

Source/core/paint/DrawingRecorderTest.cpp

 // 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 "config.h"
 #include "core/paint/RenderDrawingRecorder.h"
 
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderView.h"
 #include "core/rendering/RenderingTestHelper.h"
@@ skipping 23 matching lines @@
 
         m_renderView = document().view()->renderView();
         ASSERT_TRUE(m_renderView);
     }
 
     RenderView* m_renderView;
 };
 
 void drawNothing(GraphicsContext* context, RenderView* renderer, PaintPhase phase, const FloatRect& bound)
 {
-    RenderDrawingRecorder drawingRecorder(context, renderer, phase, bound);
+    RenderDrawingRecorder drawingRecorder(context, *renderer, phase, bound);
 }
 
 void drawRect(GraphicsContext* context, RenderView* renderer, PaintPhase phase, const FloatRect& bound)
 {
-    RenderDrawingRecorder drawingRecorder(context, renderer, phase, bound);
+    RenderDrawingRecorder drawingRecorder(context, *renderer, phase, bound);
+    if (drawingRecorder.canUseCachedDrawing())
+        return;
     IntRect rect(0, 0, 10, 10);
     context->drawRect(rect);
 }
 
 
 TEST_F(DrawingRecorderTest, DrawingRecorderTest_Nothing)
 {
     GraphicsContext context(nullptr, &rootDisplayItemList());
     FloatRect bound = renderView()->viewRect();
     EXPECT_EQ((size_t)0, rootDisplayItemList().paintList().size());
 
     drawNothing(&context, renderView(), PaintPhaseForeground, bound);
     EXPECT_EQ((size_t)0, rootDisplayItemList().paintList().size());
 }
 
 TEST_F(DrawingRecorderTest, DrawingRecorderTest_Rect)
 {
     GraphicsContext context(nullptr, &rootDisplayItemList());
     FloatRect bound = renderView()->viewRect();
     drawRect(&context, renderView(), PaintPhaseForeground, bound);
     EXPECT_EQ((size_t)1, rootDisplayItemList().paintList().size());
 }
 
 }
 }