cc: Explicitly invalidate all dropped recordings on the main thread.

cc/resources/tile.h

 // 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.
 
 #ifndef CC_RESOURCES_TILE_H_
 #define CC_RESOURCES_TILE_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 91 matching lines @@
 
   gfx::Rect opaque_rect() const { return opaque_rect_; }
   float contents_scale() const { return contents_scale_; }
   gfx::Rect content_rect() const { return content_rect_; }
 
   int layer_id() const { return layer_id_; }
 
   int source_frame_number() const { return source_frame_number_; }
 
   void set_picture_pile(scoped_refptr<PicturePileImpl> pile) {
-    DCHECK(pile->CanRaster(contents_scale_, content_rect_));
+    DCHECK(pile->CanRaster(contents_scale_, content_rect_))
+        << gfx::ScaleToEnclosingRect(content_rect_, 1.f / contents_scale_)
+               .ToString();
     picture_pile_ = pile;
   }
 
   size_t GPUMemoryUsageInBytes() const;
 
   gfx::Size size() const { return tile_size_.size(); }
 
   RasterMode DetermineRasterModeForTree(WhichTree tree) const;
   RasterMode DetermineOverallRasterMode() const;
 
@@ skipping 50 matching lines @@
 
   Id id_;
   static Id s_next_id_;
 
   DISALLOW_COPY_AND_ASSIGN(Tile);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_H_