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

chrome/browser/printing/print_preview_dialog_controller.cc

Index: chrome/browser/printing/print_preview_dialog_controller.cc
diff --git a/chrome/browser/printing/print_preview_dialog_controller.cc b/chrome/browser/printing/print_preview_dialog_controller.cc
index 6211d5c39e99661f74f0542e1160510e06b3018d..19b82a39479d5150793193574509b2bebff38db5 100644
--- a/chrome/browser/printing/print_preview_dialog_controller.cc
+++ b/chrome/browser/printing/print_preview_dialog_controller.cc
@@ -78,9 +78,7 @@ PrintPreviewDialogDelegate::~PrintPreviewDialogDelegate() {
 }
 
 ui::ModalType PrintPreviewDialogDelegate::GetDialogModalType() const {
-  // Not used, returning dummy value.
-  NOTREACHED();
-  return ui::MODAL_TYPE_WINDOW;
+  return ui::MODAL_TYPE_CHILD;
 }
 
 base::string16 PrintPreviewDialogDelegate::GetDialogTitle() const {
@@ -99,10 +97,16 @@ void PrintPreviewDialogDelegate::GetWebUIMessageHandlers(
 
 void PrintPreviewDialogDelegate::GetDialogSize(gfx::Size* size) const {
   DCHECK(size);
-  const gfx::Size kMinDialogSize(800, 480);
   const int kBorder = 25;
+// Gives ChromeOS dialogs the requested minimum size of 438x455 without changing
+// the existing behavior on Mac OSX. For all other platforms, the min size
+// is later overriden by the size of the parent window.
+#if defined(OS_MACOSX)
+  const gfx::Size kMinDialogSize(800, 480);
+#else
+  const gfx::Size kMinDialogSize(438, 455);
+#endif
   *size = kMinDialogSize;
-
   web_modal::WebContentsModalDialogHost* host = nullptr;
   content::WebContents* outermost_web_contents =
       guest_view::GuestViewBase::GetTopLevelWebContents(initiator_);
@@ -114,8 +118,15 @@ void PrintPreviewDialogDelegate::GetDialogSize(gfx::Size* size) const {
     size->SetToMax(host->GetMaximumDialogSize());
   else
     size->SetToMax(outermost_web_contents->GetContainerBounds().size());
-  size->Enlarge(-2 * kBorder, -kBorder);
-
+#if defined(OS_MACOSX)
+  size->Enlarge(-2*kBorder, -kBorder);
+#else
+  int expand_width =
+      std::min(size->width() - kMinDialogSize.width(), 2 * kBorder);
+  int expand_height =
+      std::min(size->height() - kMinDialogSize.height(), kBorder);
+  size->Enlarge(-expand_width, -expand_height);
+#endif
 #if defined(OS_MACOSX)
   // Limit the maximum size on MacOS X.
   // http://crbug.com/105815
@@ -365,10 +376,9 @@ WebContents* PrintPreviewDialogController::CreatePrintPreviewDialog(
 
   // The dialog delegates are deleted when the dialog is closed.
   ConstrainedWebDialogDelegate* web_dialog_delegate =
-      ShowConstrainedWebDialog(initiator->GetBrowserContext(),
-                               new PrintPreviewDialogDelegate(initiator),
-                               initiator);
-
+      ShowNonClippedConstrainedWebDialog(
+          initiator->GetBrowserContext(),
+          new PrintPreviewDialogDelegate(initiator), initiator);
   WebContents* preview_dialog = web_dialog_delegate->GetWebContents();
 
   // Clear the zoom level for the print preview dialog so it isn't affected by