Refactor DrawingRecorders to check for cached drawings earlier

Source/web/WebGraphicsContextImpl.cpp

Index: Source/web/WebGraphicsContextImpl.cpp
diff --git a/Source/web/WebGraphicsContextImpl.cpp b/Source/web/WebGraphicsContextImpl.cpp
index 2effc1b5d8c10b495fd56f2415c8f1a482e3668a..d40c99f06b8421895790a8a007fa673119036a0a 100644
--- a/Source/web/WebGraphicsContextImpl.cpp
+++ b/Source/web/WebGraphicsContextImpl.cpp
@@ -30,10 +30,8 @@ WebCanvas* WebGraphicsContextImpl::beginDrawing(const WebFloatRect& bounds)
     ASSERT(!m_hasBegunDrawing);
     m_hasBegunDrawing = true;
 #endif
+    ASSERT(!DrawingRecorder::useCachedDrawingIfPossible(m_graphicsContext, m_client, m_type));
     m_drawingRecorder = adoptPtr(new DrawingRecorder(m_graphicsContext, m_client, m_type, bounds));
-
-    ASSERT(!m_drawingRecorder->canUseCachedDrawing());
-
     WebCanvas* canvas = m_graphicsContext.canvas();
     ASSERT(canvas);
     return canvas;