* 跟进一下新版的skpicture的用法。这是为了修复显示“低多面体动画”时，白屏的问题

Author: weolar

cc/raster/RasterTask.cpp

@@ -241,8 +241,8 @@ class RasterTask : public blink::WebThread::Task {
     {
         skia::AnalysisCanvas canvas(tilePos.width(), tilePos.height());
         canvas.translate(-tilePos.x(), -tilePos.y());
-        canvas.clipRect(tilePos, SkRegion::kIntersect_Op);
-        canvas.drawPicture(m_picture);
+        canvas.clipRect(tilePos, SkRegion::kIntersect_Op);
+        m_picture->playback(&canvas, &canvas);
 
         return canvas.GetColorIfSolid(color);
     }
@@ -282,8 +282,6 @@ class RasterTask : public blink::WebThread::Task {
             if (isSolidColor) {
                 info->m_solidColor = new SkColor(solidColor);
                 info->m_isSolidColorCoverWholeTile = m_dirtyRect.contains(tilePos);
-            } else {
-                
             }
         }