Allow a Views client to provide a default frameview for window widgets.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
===================================================================
--- chrome/browser/about_flags.cc	(revision 117091)
+++ chrome/browser/about_flags.cc	(working copy)
@@ -465,6 +465,13 @@
     kOsWin | kOsLinux | kOsCrOS,
     SINGLE_VALUE_TYPE(ash::switches::kAuraTranslucentFrames)
   },
+  {
+    "aura-kennedy-dialog-frames",
+    IDS_FLAGS_AURA_KENNEDY_DIALOG_FRAMES_NAME,
+    IDS_FLAGS_AURA_KENNEDY_DIALOG_FRAMES_DESCRIPTION,
+    kOsWin | kOsLinux | kOsCrOS,
+    SINGLE_VALUE_TYPE(ash::switches::kAuraKennedyDialogFrames)
+  },
 #endif  // defined(USE_AURA)
   {
     "enable-gamepad",