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

components/web_modal/web_contents_modal_dialog_manager.h

 // Copyright 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.
 
 #ifndef COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_MANAGER_H_
 #define COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_MANAGER_H_
 
 #include <deque>
 #include <memory>
 
@@ skipping 13 matching lines @@
       public content::WebContentsObserver,
       public content::WebContentsUserData<WebContentsModalDialogManager> {
  public:
   ~WebContentsModalDialogManager() override;
 
   WebContentsModalDialogManagerDelegate* delegate() const { return delegate_; }
   void SetDelegate(WebContentsModalDialogManagerDelegate* d);
 
   static SingleWebContentsDialogManager* CreateNativeWebModalManager(
       gfx::NativeWindow dialog,
-      SingleWebContentsDialogManagerDelegate* native_delegate);
+      SingleWebContentsDialogManagerDelegate* native_delegate,
+      bool* independent_bounds,
+      const char * kHasIndependentBoundsKey);
 
   // Shows the dialog as a web contents modal dialog. The dialog will notify via
   // WillClose() when it is being destroyed.
-  void ShowModalDialog(gfx::NativeWindow dialog);
+  void ShowModalDialog(gfx::NativeWindow dialog, bool *independent_bounds,
+                       const char * kHasIndependentBoundsKey);

[Mike Wittman, 2016/08/05 16:03:46]

I think you can avoid all this threading of independent bounds state with the
following:

- add a new function here, like ShowNonClippedModalDialog
- keep track of which gfx::NativeWindows want non-clipped display within
WebContentsModalDialogManager
- add a IsNonClipped(gfx::NativeWindow) function on
WebContentsModalDialogManagerDelegate and implement it here
- in NativeWebContentsModalDialogManagerViews::ManageDialog:
  if (native_delegate_->IsNonClipped(dialog()))
    child->SetNativeWindowProperty(...);

[rbpotter, 2016/08/12 16:36:07]

Done.

 
   // Allow clients to supply their own native dialog manager. Suitable for
   // bubble clients.
   void ShowDialogWithManager(
       gfx::NativeWindow dialog,
       std::unique_ptr<SingleWebContentsDialogManager> manager);
 
   // Returns true if any dialogs are active and not closed.
   bool IsDialogActive() const;
 
@@ skipping 67 matching lines @@
 
   // True while closing the dialogs on WebContents close.
   bool closing_all_dialogs_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsModalDialogManager);
 };
 
 }  // namespace web_modal
 
 #endif  // COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_MANAGER_H_