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

components/constrained_window/constrained_window_views.cc

Index: components/constrained_window/constrained_window_views.cc
diff --git a/components/constrained_window/constrained_window_views.cc b/components/constrained_window/constrained_window_views.cc
index 15fad72bf5bac3f6b9882971a16bc56e439901e4..e47b495f1c2b7e82ad81755baac5b781e45a1527 100644
--- a/components/constrained_window/constrained_window_views.cc
+++ b/components/constrained_window/constrained_window_views.cc
@@ -5,6 +5,9 @@
 #include "components/constrained_window/constrained_window_views.h"
 
 #include <algorithm>
+#if defined(OS_MACOSX)
+#include <utility>
+#endif
 
 #include "base/macros.h"
 #include "build/build_config.h"
@@ -18,6 +21,11 @@
 #include "ui/views/widget/widget_observer.h"
 #include "ui/views/window/dialog_delegate.h"
 
+#if defined(USE_AURA)
+#include "ui/aura/window.h"
+#include "ui/wm/core/window_modality_controller.h"
+#endif
+
 #if defined(OS_MACOSX)
 #import "components/constrained_window/native_web_contents_modal_dialog_manager_views_mac.h"
 #endif
@@ -111,6 +119,19 @@ void UpdateModalDialogPosition(views::Widget* widget,
   if (widget->is_top_level())
     position += host_widget->GetClientAreaBoundsInScreen().OffsetFromOrigin();
 
+#if defined(USE_AURA)
+  // Prevents widgets that extend outside the parent window from having their
+  // horizontal position centered on the center of the parent window. Instead,
+  // positions top left corner in parent top left corner so widget extends
+  // below and to the right of the parent window.
+  if (widget->GetNativeWindowProperty(wm::kAllowTransientParentEventsKey)) {
+    gfx::Rect bound = dialog_host->GetHostView()->GetBoundsInScreen();
+    if (bound.width() - border->GetInsets().left() < size.width()) {
+      position.set_x(position.x() + (size.width() - bound.width()) / 2 +
+                     border->GetInsets().left());
+    }
+  }
+#endif
   widget->SetBounds(gfx::Rect(position, size));
 }
 
@@ -135,7 +156,14 @@ void UpdateWebContentsModalDialogPosition(
   // Border may be null during widget initialization.
   if (border)
     max_size.Enlarge(0, border->GetInsets().top());
-  size.SetToMin(max_size);
+#if defined(USE_AURA)
+  bool has_independent_bounds =
+      !!(widget->GetNativeWindowProperty(wm::kAllowTransientParentEventsKey));
+#else
+  bool has_independent_bounds = false;
+#endif
+  if (!has_independent_bounds)
+    size.SetToMin(max_size);
   UpdateModalDialogPosition(widget, dialog_host, size);
 }
 
@@ -179,6 +207,25 @@ views::Widget* ShowWebModalDialogWithOverlayViews(
 }
 #endif
 
+views::Widget* ShowTopLevelWebModalDialogViews(
+    views::WidgetDelegate* dialog,
+    content::WebContents* initiator_web_contents,
+    ui::AcceleratorTarget* target) {
+  DCHECK(constrained_window_views_client);
+  // For embedded WebContents, use the embedder's WebContents for constrained
+  // window.
+  content::WebContents* web_contents =
+      guest_view::GuestViewBase::GetTopLevelWebContents(initiator_web_contents);
+  gfx::NativeWindow parent = web_contents->GetTopLevelNativeWindow();
+  gfx::NativeView parent_view =
+      parent ? constrained_window_views_client->GetDialogHostView(parent)
+             : nullptr;
+  views::Widget* widget =
+      views::DialogDelegate::CreateDialogWidget(dialog, nullptr, parent_view);
+  ShowTopLevelModalDialog(widget->GetNativeWindow(), web_contents, target);
+  return widget;
+}
+
 views::Widget* CreateWebModalDialogViews(views::WidgetDelegate* dialog,
                                          content::WebContents* web_contents) {
   DCHECK_EQ(ui::MODAL_TYPE_CHILD, dialog->GetModalType());
@@ -225,4 +272,4 @@ views::Widget* CreateBrowserModalDialogViews(views::DialogDelegate* dialog,
   return widget;
 }
 
-}  // namespace constrained window
+}  // namespace constrained_window