[blimp] Add SkPicture caching support.

cc/playback/clip_display_item.h

Index: cc/playback/clip_display_item.h
diff --git a/cc/playback/clip_display_item.h b/cc/playback/clip_display_item.h
index 249e30e98c7cd9de5a3c62d0d2efca43a7950285..34ab55e5ba41383d0e0803d24f4b30ecb8d63d77 100644
--- a/cc/playback/clip_display_item.h
+++ b/cc/playback/clip_display_item.h
@@ -18,7 +18,6 @@
 class SkCanvas;
 
 namespace cc {
-class ImageSerializationProcessor;
 
 class CC_EXPORT ClipDisplayItem : public DisplayItem {
  public:
@@ -27,9 +26,7 @@ class CC_EXPORT ClipDisplayItem : public DisplayItem {
   explicit ClipDisplayItem(const proto::DisplayItem& proto);
   ~ClipDisplayItem() override;
 
-  void ToProtobuf(proto::DisplayItem* proto,
-                  ImageSerializationProcessor* image_serialization_processor)
-      const override;
+  void ToProtobuf(proto::DisplayItem* proto) const override;
   void Raster(SkCanvas* canvas,
               const gfx::Rect& canvas_target_playback_rect,
               SkPicture::AbortCallback* callback) const override;
@@ -53,9 +50,7 @@ class CC_EXPORT EndClipDisplayItem : public DisplayItem {
   explicit EndClipDisplayItem(const proto::DisplayItem& proto);
   ~EndClipDisplayItem() override;
 
-  void ToProtobuf(proto::DisplayItem* proto,
-                  ImageSerializationProcessor* image_serialization_processor)
-      const override;
+  void ToProtobuf(proto::DisplayItem* proto) const override;
   void Raster(SkCanvas* canvas,
               const gfx::Rect& canvas_target_playback_rect,
               SkPicture::AbortCallback* callback) const override;