[blimp] Add SkPicture caching support.

cc/playback/display_item_list_unittest.cc

Index: cc/playback/display_item_list_unittest.cc
diff --git a/cc/playback/display_item_list_unittest.cc b/cc/playback/display_item_list_unittest.cc
index 88ba7e8e284874a0a74de743237429d06d3ba408..45a5c04ee442ffc283018070af3c54d7a3f9bc21 100644
--- a/cc/playback/display_item_list_unittest.cc
+++ b/cc/playback/display_item_list_unittest.cc
@@ -20,8 +20,11 @@
 #include "cc/playback/float_clip_display_item.h"
 #include "cc/playback/transform_display_item.h"
 #include "cc/proto/display_item.pb.h"
+#include "cc/test/fake_client_picture_cache.h"
+#include "cc/test/fake_engine_picture_cache.h"
 #include "cc/test/fake_image_serialization_processor.h"
 #include "cc/test/skia_common.h"
+#include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkCanvas.h"
@@ -83,12 +86,27 @@ void ValidateDisplayItemListSerialization(const gfx::Size& layer_size,
   std::unique_ptr<FakeImageSerializationProcessor>
       fake_image_serialization_processor =
           base::WrapUnique(new FakeImageSerializationProcessor);
+  std::unique_ptr<EnginePictureCache> fake_engine_picture_cache_uniq =

[vmpstr, 2016/06/24 18:58:32]

in cc, we usually do

std::unique_ptr<Foo> foo = ...;
Foo* foo_ptr = foo.get();

or

Foo* raw_foo = foo.get();

[nyquist, 2016/06/24 20:31:23]

Done.

+      fake_image_serialization_processor->CreateEnginePictureCache();
+  FakeEnginePictureCache* fake_engine_picture_cache =
+      static_cast<FakeEnginePictureCache*>(
+          fake_engine_picture_cache_uniq.get());
+  std::unique_ptr<ClientPictureCache> fake_client_picture_cache =
+      fake_image_serialization_processor->CreateClientPictureCache();
+
+  fake_engine_picture_cache->MarkAllSkPicturesAsUsed(list.get());
 
   // Serialize and deserialize the DisplayItemList.
   proto::DisplayItemList proto;
-  list->ToProtobuf(&proto, fake_image_serialization_processor.get());
+  list->ToProtobuf(&proto);
+
+  std::vector<uint32_t> actual_picture_ids;
   scoped_refptr<DisplayItemList> new_list = DisplayItemList::CreateFromProto(
-      proto, fake_image_serialization_processor.get());
+      proto, fake_client_picture_cache.get(), &actual_picture_ids);
+
+  EXPECT_THAT(actual_picture_ids,
+              testing::UnorderedElementsAreArray(
+                  fake_engine_picture_cache->GetAllUsedPictureIds()));
 
   EXPECT_TRUE(
       AreDisplayListDrawingResultsSame(gfx::Rect(layer_size), list, new_list));