Add Generic Implementation of ClipboardRecentContent

components/open_from_clipboard/BUILD.gn

Index: components/open_from_clipboard/BUILD.gn
diff --git a/components/open_from_clipboard/BUILD.gn b/components/open_from_clipboard/BUILD.gn
index fe46837a69abecb892c0d7406bb953cc30035c1a..5b8bad57a453dddff85a1fcd36f912a2d2a0f0e8 100644
--- a/components/open_from_clipboard/BUILD.gn
+++ b/components/open_from_clipboard/BUILD.gn
@@ -6,6 +6,8 @@ static_library("open_from_clipboard") {
   sources = [
     "clipboard_recent_content.cc",
     "clipboard_recent_content.h",
+    "clipboard_recent_content_generic.cc",
+    "clipboard_recent_content_generic.h",
     "clipboard_recent_content_ios.h",
     "clipboard_recent_content_ios.mm",
   ]
@@ -33,6 +35,7 @@ static_library("test_support") {
 source_set("unit_tests") {
   testonly = true
   sources = [
+    "clipboard_recent_content_generic_unittest.cc",
     "clipboard_recent_content_ios_unittest.mm",
   ]
 
@@ -40,5 +43,6 @@ source_set("unit_tests") {
     ":open_from_clipboard",
     "//base",
     "//testing/gtest",
+    "//ui/base",
   ]
 }