cc: Rasterize cheap tiles immediately

cc/picture.cc

 // Copyright 2012 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 "base/debug/trace_event.h"
 #include "cc/content_layer_client.h"
 #include "cc/picture.h"
 #include "cc/rendering_stats.h"
 #include "skia/ext/analysis_canvas.h"
 #include "third_party/skia/include/core/SkCanvas.h"
@@ skipping 96 matching lines @@
   DCHECK(picture_);
 
   canvas->save();
   canvas->clipRect(gfx::RectToSkRect(content_rect));
   canvas->scale(contents_scale, contents_scale);
   canvas->translate(layer_rect_.x(), layer_rect_.y());
   canvas->drawPicture(*picture_);
   canvas->restore();
 }
 
-bool Picture::IsCheapInRect(const gfx::Rect& layer_rect) {
+bool Picture::IsCheapInRect(const gfx::Rect& layer_rect) const {
   TRACE_EVENT0("cc", "Picture::IsCheapInRect");
 
   SkBitmap emptyBitmap;
   emptyBitmap.setConfig(SkBitmap::kNo_Config, layer_rect.width(),
                         layer_rect.height());
   skia::AnalysisDevice device(emptyBitmap);
   skia::AnalysisCanvas canvas(&device);
 
   canvas.drawPicture(*picture_);
   return canvas.isCheap();
@@ skipping 21 matching lines @@
     if (*refs && (*refs)->getURI() && !strncmp(
         (*refs)->getURI(), labelLazyDecoded, 4)) {
       pixel_ref_list.push_back(static_cast<skia::LazyPixelRef*>(*refs));
     }
     refs++;
   }
   pixel_refs->unref();
 }
 
 }  // namespace cc