SetNeedsRedraw directly when updating a visible tile.

cc/resources/picture_pile_impl.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_PICTURE_PILE_IMPL_H_
 #define CC_RESOURCES_PICTURE_PILE_IMPL_H_
 
 #include <list>
 #include <map>
 #include <set>
 #include <vector>
 
 #include "base/time/time.h"
 #include "cc/base/cc_export.h"
 #include "cc/debug/rendering_stats_instrumentation.h"
 #include "cc/resources/picture_pile_base.h"
 #include "cc/resources/raster_source.h"
 #include "skia/ext/analysis_canvas.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkPicture.h"
 
+class SkCanvas;
+class SkPicture;
+class SkPixelRef;
+
+namespace gfx {
+class Rect;
+}
+
 namespace cc {
 
 // TODO(vmpstr): Clean up PicturePileBase and make it a member.
 class CC_EXPORT PicturePileImpl : public RasterSource {
  public:
   static scoped_refptr<PicturePileImpl> Create();
   static scoped_refptr<PicturePileImpl> CreateFromOther(
       const PicturePileBase* other);
 
   // RasterSource overrides. See RasterSource header for full description.
@@ skipping 110 matching lines @@
   gfx::Rect PaddedRect(const PictureMapKey& key) const;
 
   bool should_attempt_to_use_distance_field_text_;
 
   DISALLOW_COPY_AND_ASSIGN(PicturePileImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_PILE_IMPL_H_