Browser tests for OOPIF support for drag-n-drop.

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 511e8c29ccd9319a02092788d964da29f5303e2b..fd365eb71fb267ca0de6dd562c22bbe298c16b8f 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -816,6 +816,10 @@ test("content_browsertests") {
     deps += [ "//chromeos" ]
   }
 
+  if (use_aura) {
+    sources += [ "../browser/web_contents/drag_and_drop_browsertest.cc" ]

[Łukasz Anforowicz, 2016/11/01 23:43:42]

Hopefully aura-only only is okay for now.  aura-only means that we are ignoring
web_contents_view_android.cc and web_contents/web_drag_*_mac.mm

Also - for thinking about the proper level to do the drag-and-drop simulation,
it might be useful to note chrome/test/base/interactive_test_utils* which come
in multiple platform-specific flavors.  For now the new browser test can live in
the //content layer though, so landing the CL as-is seems okay.

+  }
+
   if (use_aura && !is_win) {
     deps += [ "//ui/events:test_support" ]
   }