Refactor DrawingRecorders to check for cached drawings earlier

Source/platform/scroll/ScrollbarThemeMock.cpp

Index: Source/platform/scroll/ScrollbarThemeMock.cpp
diff --git a/Source/platform/scroll/ScrollbarThemeMock.cpp b/Source/platform/scroll/ScrollbarThemeMock.cpp
index 96c10024c24bec6b5e48c6deb8b35dbb05abab8c..7303704e616abf2f564146d7e054563c36063540 100644
--- a/Source/platform/scroll/ScrollbarThemeMock.cpp
+++ b/Source/platform/scroll/ScrollbarThemeMock.cpp
@@ -52,20 +52,23 @@ bool ScrollbarThemeMock::usesOverlayScrollbars() const
 
 void ScrollbarThemeMock::paintTrackBackground(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& trackRect)
 {
-    DrawingRecorder recorder(*context, *scrollbar, DisplayItem::ScrollbarTrackBackground, trackRect);
-    if (recorder.canUseCachedDrawing())
+    if (DrawingRecorder::useCachedDrawingIfPossible(*context, *scrollbar, DisplayItem::ScrollbarTrackBackground))
         return;
+
+    DrawingRecorder recorder(*context, *scrollbar, DisplayItem::ScrollbarTrackBackground, trackRect);
     context->fillRect(trackRect, scrollbar->enabled() ? Color::lightGray : Color(0xFFE0E0E0));
 }
 
 void ScrollbarThemeMock::paintThumb(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& thumbRect)
 {
-    if (scrollbar->enabled()) {
-        DrawingRecorder recorder(*context, *scrollbar, DisplayItem::ScrollbarThumb, thumbRect);
-        if (recorder.canUseCachedDrawing())
-            return;
-        context->fillRect(thumbRect, Color::darkGray);
-    }
+    if (!scrollbar->enabled())
+        return;
+
+    if (DrawingRecorder::useCachedDrawingIfPossible(*context, *scrollbar, DisplayItem::ScrollbarThumb))
+        return;
+
+    DrawingRecorder recorder(*context, *scrollbar, DisplayItem::ScrollbarThumb, thumbRect);
+    context->fillRect(thumbRect, Color::darkGray);
 }
 
 }