[blimp] Add SkPicture caching support.

cc/playback/compositing_display_item.cc

Index: cc/playback/compositing_display_item.cc
diff --git a/cc/playback/compositing_display_item.cc b/cc/playback/compositing_display_item.cc
index 1626933596d4719e1b67917cbeaf6ef2305a501c..521bcd15dfb7901c27798c7aa3f80af0fa323f4f 100644
--- a/cc/playback/compositing_display_item.cc
+++ b/cc/playback/compositing_display_item.cc
@@ -21,7 +21,6 @@
 #include "ui/gfx/skia_util.h"
 
 namespace cc {
-class ImageSerializationProcessor;
 
 CompositingDisplayItem::CompositingDisplayItem(
     uint8_t alpha,
@@ -78,9 +77,7 @@ void CompositingDisplayItem::SetNew(uint8_t alpha,
   lcd_text_requires_opaque_layer_ = lcd_text_requires_opaque_layer;
 }
 
-void CompositingDisplayItem::ToProtobuf(
-    proto::DisplayItem* proto,
-    ImageSerializationProcessor* image_serialization_processor) const {
+void CompositingDisplayItem::ToProtobuf(proto::DisplayItem* proto) const {
   proto->set_type(proto::DisplayItem::Type_Compositing);
 
   proto::CompositingDisplayItem* details = proto->mutable_compositing_item();
@@ -142,9 +139,7 @@ EndCompositingDisplayItem::EndCompositingDisplayItem(
 EndCompositingDisplayItem::~EndCompositingDisplayItem() {
 }
 
-void EndCompositingDisplayItem::ToProtobuf(
-    proto::DisplayItem* proto,
-    ImageSerializationProcessor* image_serialization_processor) const {
+void EndCompositingDisplayItem::ToProtobuf(proto::DisplayItem* proto) const {
   proto->set_type(proto::DisplayItem::Type_EndCompositing);
 }