[ios] TabCollectionTabCell to use SnapshotCache.

ios/clean/chrome/browser/ui/tab_collection/BUILD.gn

Index: ios/clean/chrome/browser/ui/tab_collection/BUILD.gn
diff --git a/ios/clean/chrome/browser/ui/tab_collection/BUILD.gn b/ios/clean/chrome/browser/ui/tab_collection/BUILD.gn
index 6239acda6ea1661dd9cbad8c437e001eb3ace8d9..e9bb6bd9798cfa9a87834ed65a826f31bee2f952 100644
--- a/ios/clean/chrome/browser/ui/tab_collection/BUILD.gn
+++ b/ios/clean/chrome/browser/ui/tab_collection/BUILD.gn
@@ -30,6 +30,7 @@ source_set("tab_collection_ui") {
   deps = [
     "//base",
     "//ios/chrome/app/theme:theme_grit",
+    "//ios/chrome/browser/snapshots",
     "//ios/chrome/browser/ui",
     "//ios/chrome/browser/ui/tab_switcher",
     "//ios/clean/chrome/browser/ui/commands",
@@ -40,6 +41,7 @@ source_set("tab_collection_ui") {
 source_set("unit_tests") {
   sources = [
     "tab_collection_mediator_unittest.mm",
+    "tab_collection_tab_cell_unittest.mm",
     "tab_collection_view_controller_unittest.mm",
   ]
   deps = [
@@ -47,6 +49,8 @@ source_set("unit_tests") {
     ":tab_collection_ui",
     "//base",
     "//base/test:test_support",
+    "//ios/chrome/browser/snapshots",
+    "//ios/chrome/browser/ui/tab_switcher",
     "//ios/chrome/browser/web",
     "//ios/chrome/browser/web_state_list",
     "//ios/chrome/browser/web_state_list:test_support",
@@ -54,6 +58,7 @@ source_set("unit_tests") {
     "//ios/web/public/test/fakes",
     "//testing/gtest",
     "//third_party/ocmock",
+    "//ui/base:test_support",
     "//url:url",
   ]
   configs += [ "//build/config/compiler:enable_arc" ]