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

components/web_modal/web_contents_modal_dialog_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
 
 #include <utility>
 
 #include "components/web_modal/web_contents_modal_dialog_manager_delegate.h"
 #include "content/public/browser/navigation_details.h"
@@ skipping 23 matching lines @@
     (*it)->manager->HostChanged(d ? d->GetWebContentsModalDialogHost() : NULL);
   }
 }
 
 void WebContentsModalDialogManager::ShowModalDialog(gfx::NativeWindow dialog) {
   std::unique_ptr<SingleWebContentsDialogManager> mgr(
       CreateNativeWebModalManager(dialog, this));
   ShowDialogWithManager(dialog, std::move(mgr));
 }
 
+// Shows the modal dialog and records that it has a non clipped display (not
+// constrained to bounds of parent window).
+void WebContentsModalDialogManager::ShowNonClippedModalDialog(
+    gfx::NativeWindow dialog) {
+  nonclipped_child_dialogs_.push_back(dialog);
+  std::unique_ptr<SingleWebContentsDialogManager> mgr(
+      CreateNativeWebModalManager(dialog, this));
+  ShowDialogWithManager(dialog, std::move(mgr));
+}
+
 // TODO(gbillock): Maybe "ShowBubbleWithManager"?
 void WebContentsModalDialogManager::ShowDialogWithManager(
     gfx::NativeWindow dialog,
     std::unique_ptr<SingleWebContentsDialogManager> manager) {
   if (delegate_)
     manager->HostChanged(delegate_->GetWebContentsModalDialogHost());
   child_dialogs_.push_back(new DialogState(dialog, std::move(manager)));
 
   if (child_dialogs_.size() == 1) {
     BlockWebContentsInteraction(true);
     if (delegate_ && delegate_->IsWebContentsVisible(web_contents()))
       child_dialogs_.back()->manager->Show();
   }
 }
 
 bool WebContentsModalDialogManager::IsDialogActive() const {
   return !child_dialogs_.empty();
 }
 
 void WebContentsModalDialogManager::FocusTopmostDialog() const {
   DCHECK(!child_dialogs_.empty());
   child_dialogs_.front()->manager->Focus();
 }
 
 content::WebContents* WebContentsModalDialogManager::GetWebContents() const {
   return web_contents();
 }
 
 void WebContentsModalDialogManager::WillClose(gfx::NativeWindow dialog) {

[Mike Wittman, 2016/08/12 22:51:34]

The dialog should be removed from nonclipped_child_dialogs_ here.

[rbpotter, 2016/08/15 18:03:45]

Done.

   WebContentsModalDialogList::iterator dlg = FindDialogState(dialog);
 
   // The Views tab contents modal dialog calls WillClose twice.  Ignore the
   // second invocation.
   if (dlg == child_dialogs_.end())
     return;
 
   bool removed_topmost_dialog = dlg == child_dialogs_.begin();
   std::unique_ptr<DialogState> deleter(*dlg);
   child_dialogs_.erase(dlg);
   if (!child_dialogs_.empty() && removed_topmost_dialog &&
       !closing_all_dialogs_) {
     child_dialogs_.front()->manager->Show();
   }
 
   BlockWebContentsInteraction(!child_dialogs_.empty());
 }
 
+bool WebContentsModalDialogManager::IsNonClipped(gfx::NativeWindow dialog) {
+  NativeWindowDialogList::iterator i;
+  for (i = nonclipped_child_dialogs_.begin();
+       i != nonclipped_child_dialogs_.end(); ++i) {
+    if ((*i) == dialog)
+      break;
+  }
+  if (i != nonclipped_child_dialogs_.end())
+    return true;
+  return false;
+}
+
 WebContentsModalDialogManager::WebContentsModalDialogManager(
     content::WebContents* web_contents)
     : content::WebContentsObserver(web_contents),
       delegate_(NULL),
       closing_all_dialogs_(false) {
 }
 
 WebContentsModalDialogManager::DialogState::DialogState(
     gfx::NativeWindow dialog,
     std::unique_ptr<SingleWebContentsDialogManager> mgr)
@@ skipping 74 matching lines @@
   // some of these to close.  CloseAllDialogs is async, so it might get called
   // twice before it runs.
   CloseAllDialogs();
 }
 
 void WebContentsModalDialogManager::DidAttachInterstitialPage() {
   CloseAllDialogs();
 }
 
 }  // namespace web_modal