aura: Draw drop shadows under browsers and menus.

chrome/browser/ui/views/frame/browser_frame_aura.cc

Index: chrome/browser/ui/views/frame/browser_frame_aura.cc
diff --git a/chrome/browser/ui/views/frame/browser_frame_aura.cc b/chrome/browser/ui/views/frame/browser_frame_aura.cc
index 3b55088a589f1215d806fcc6c988b61814160c86..4cac0c8cc90911bf02d684cb77dda709c0d4c4b4 100644
--- a/chrome/browser/ui/views/frame/browser_frame_aura.cc
+++ b/chrome/browser/ui/views/frame/browser_frame_aura.cc
@@ -13,6 +13,9 @@
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/aura/aura_switches.h"
+#include "ui/aura/client/aura_constants.h"
+#include "ui/aura/client/shadow_types.h"
+#include "ui/aura/window.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/theme_provider.h"
 #include "ui/gfx/canvas.h"
@@ -169,6 +172,9 @@ BrowserFrameAura::BrowserFrameAura(BrowserFrame* browser_frame,
     browser_view_->layer()->SetFillsBoundsOpaquely(false);
     // Background only needed for Aura-style windows.
     browser_view_->set_background(new ToolbarBackground(browser_view));
+  } else {
+    GetNativeWindow()->SetIntProperty(aura::kShadowTypeKey,
+                                      aura::SHADOW_TYPE_RECTANGULAR);
   }
 }