Mac: make save/open dialogs operate as tab-modal sheets....

chrome/browser/cocoa/tab_strip_controller.mm

Index: chrome/browser/cocoa/tab_strip_controller.mm
diff --git a/chrome/browser/cocoa/tab_strip_controller.mm b/chrome/browser/cocoa/tab_strip_controller.mm
index 2f10f27e9c06d0dee03d346d3a807170a6a4c330..5cd69cf06fb7f0ea4fc8949878b3b567a7a6e87e 100644
--- a/chrome/browser/cocoa/tab_strip_controller.mm
+++ b/chrome/browser/cocoa/tab_strip_controller.mm
@@ -194,6 +194,10 @@ static const float kIndentLeavingSpaceForControls = 64.0;
 
   // Make sure the new tabs's sheets are visible (necessary when a background
   // tab opened a sheet while it was in the background and now becomes active).
+  // TODO(viettrungluu@gmail.com): Directly iterating over the |TabContents|'s
+  // (essentially internal, private) list isn't great -- I'd like to get rid of
+  // this and somehow move it into |TabContents| itself (or provide a cleaner
+  // interface).
   TabContents* newTab = tabModel_->GetTabContentsAt(index);
   DCHECK(newTab);
   if (newTab) {
@@ -959,7 +963,17 @@ static const float kIndentLeavingSpaceForControls = 64.0;
   // to pass it to the sheet controller here.
   NSView* tabContentsView =
       [[window->owner()->GetNativeView() superview] superview];
-  window->delegate()->RunSheet([self sheetController], tabContentsView);
+  SEL frameSelector = nil;
+  SEL positionSelector = nil;
+  if (window->delegate()->GetModalityLevel() >=
+                                              ConstrainedWindow::kModalForTab) {
+    frameSelector = @selector(frameWithBars);
+    positionSelector = @selector(positionSheetBelowToolbar:usingRect:);
+  }
+  window->delegate()->RunSheet([self sheetController],
+                               tabContentsView,
+                               frameSelector,
+                               positionSelector);
 
   // TODO(avi, thakis): GTMWindowSheetController has no api to move tabsheets
   // between windows. Until then, we have to prevent having to move a tabsheet