Created min size for print preview dialog and modified to allow the

components/constrained_window/native_web_contents_modal_dialog_manager_views.cc

Index: components/constrained_window/native_web_contents_modal_dialog_manager_views.cc
diff --git a/components/constrained_window/native_web_contents_modal_dialog_manager_views.cc b/components/constrained_window/native_web_contents_modal_dialog_manager_views.cc
index dca66733a35f971af93be521c6980d0579b9f966..4378516973ac3e3960fca59efc9dc9ecf0bbe9f2 100644
--- a/components/constrained_window/native_web_contents_modal_dialog_manager_views.cc
+++ b/components/constrained_window/native_web_contents_modal_dialog_manager_views.cc
@@ -20,6 +20,7 @@
 #if defined(USE_AURA)
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/window.h"
+#include "ui/aura/window_targeter.h"
 #include "ui/wm/core/visibility_controller.h"
 #include "ui/wm/core/window_animations.h"
 #include "ui/wm/core/window_modality_controller.h"
@@ -78,6 +79,12 @@ void NativeWebContentsModalDialogManagerViews::ManageDialog() {
 
   wm::SetModalParent(widget->GetNativeWindow(),
                      native_delegate_->GetWebContents()->GetNativeView());
+#if defined(OS_CHROMEOS)
+  if (native_delegate_->IsNonClipped(dialog())) {
+    widget->SetNativeWindowProperty(aura::kHasIndependentBoundsKey,
+                                    reinterpret_cast<void*>(true));
+  }
+#endif  // OS_CHROMEOS

[Lei Zhang, 2016/08/19 03:28:47]

// defined(OS_CHROMEOS)

[rbpotter, 2016/08/19 16:59:42]

Done.

 #endif

[Lei Zhang, 2016/08/19 03:28:47]

label this one too.  // defined(USE_AURA)

[rbpotter, 2016/08/19 16:59:42]

Done.

 }