[blimp] Add SkPicture caching support.

cc/BUILD.gn

Index: cc/BUILD.gn
diff --git a/cc/BUILD.gn b/cc/BUILD.gn
index 476e66ff977c16d58d2b84edddc64a88bf2e1561..d93a5a8ee8251582169f513330d83645ec55e1f0 100644
--- a/cc/BUILD.gn
+++ b/cc/BUILD.gn
@@ -314,6 +314,10 @@ component("cc") {
     "proto/gpu_conversions.cc",
     "proto/gpu_conversions.h",
     "proto/image_serialization_processor.h",
+    "proto/picture_cache.cc",
+    "proto/picture_cache.h",
+    "proto/picture_cache_conversions.cc",
+    "proto/picture_cache_conversions.h",
     "proto/skia_conversions.cc",
     "proto/skia_conversions.h",
     "proto/synced_property_conversions.cc",
@@ -613,6 +617,8 @@ source_set("test_support") {
     "test/fake_output_surface_client.h",
     "test/fake_painted_scrollbar_layer.cc",
     "test/fake_painted_scrollbar_layer.h",
+    "test/fake_picture_cache.cc",
+    "test/fake_picture_cache.h",
     "test/fake_picture_layer.cc",
     "test/fake_picture_layer.h",
     "test/fake_picture_layer_impl.cc",
@@ -854,6 +860,7 @@ test("cc_unittests") {
     "proto/cc_conversions_unittest.cc",
     "proto/gfx_conversions_unittest.cc",
     "proto/gpu_conversions_unittest.cc",
+    "proto/picture_cache_conversions_unittest.cc",
     "proto/skia_conversions_unittest.cc",
     "proto/synced_property_conversions_unittest.cc",
     "quads/draw_polygon_unittest.cc",