cc: Avoid extra flush calls to Skia GrContext

cc/raster/gpu_rasterizer.cc

Index: cc/raster/gpu_rasterizer.cc
diff --git a/cc/raster/gpu_rasterizer.cc b/cc/raster/gpu_rasterizer.cc
index b8ad86212e49765b14f819051c285b9ef62002a9..2dcd8e078074f7cc6b59c0c6bac55088732fa059 100644
--- a/cc/raster/gpu_rasterizer.cc
+++ b/cc/raster/gpu_rasterizer.cc
@@ -79,7 +79,7 @@ void GpuRasterizer::RasterizeSource(
 
     SkMultiPictureDraw multi_picture_draw;
     multi_picture_draw.add(sk_surface->getCanvas(), picture.get());
-    multi_picture_draw.draw(msaa_sample_count_ > 0);
+    multi_picture_draw.draw(false);

[ericrk, 2016/02/09 19:31:46]

Not sure I follow the change here. I was saying that you may be able to just
pass false here and leave the flush in EndGpuRaster... just setting false here I
think misses necessary flushes. Feel free to move back to your previous
approach.

     write_lock->ReleaseSkSurface();
   }
 }