Alternate NTP Mac: Push down overlay in presentation mode

chrome/browser/ui/cocoa/tab_contents/overlayable_contents_controller.mm

Index: chrome/browser/ui/cocoa/tab_contents/overlayable_contents_controller.mm
diff --git a/chrome/browser/ui/cocoa/tab_contents/overlayable_contents_controller.mm b/chrome/browser/ui/cocoa/tab_contents/overlayable_contents_controller.mm
index 786b0766841137d425663cf234ce4e9f21530641..634f456f716cf5e94946e3639863ae0349947c85 100644
--- a/chrome/browser/ui/cocoa/tab_contents/overlayable_contents_controller.mm
+++ b/chrome/browser/ui/cocoa/tab_contents/overlayable_contents_controller.mm
@@ -22,6 +22,7 @@
 
 @synthesize drawDropShadow = drawDropShadow_;
 @synthesize activeContainerOffset = activeContainerOffset_;
+@synthesize overlayContentsOffset = overlayContentsOffset_;
 
 - (id)initWithBrowser:(Browser*)browser
      windowController:(BrowserWindowController*)windowController {
@@ -145,6 +146,14 @@
   [self layoutViews];
 }
 
+- (void)setOverlayContentsOffset:(CGFloat)overlayContentsOffset {
+  if (overlayContentsOffset_ == overlayContentsOffset)
+    return;
+
+  overlayContentsOffset_ = overlayContentsOffset;
+  [self layoutViews];
+}
+
 - (void)viewDidResize:(NSNotification*)note {
   [self layoutViews];
 }
@@ -165,8 +174,8 @@
   if (overlayContents_) {
     NSRect overlayFrame = bounds;
     overlayFrame.size.height = [self overlayHeightInPixels];
-    overlayFrame.origin.y =
-        NSMinY([topSeparatorView_ frame]) - NSHeight(overlayFrame);
+    overlayFrame.origin.y = NSMinY([topSeparatorView_ frame]) -
+                            NSHeight(overlayFrame) - overlayContentsOffset_;
     [overlayContents_->GetView()->GetNativeView() setFrame:overlayFrame];
 
     if (dropShadowView_) {
@@ -192,8 +201,8 @@
 }
 
 - (CGFloat)overlayHeightInPixels {
-  CGFloat height =
-      NSHeight([[self view] bounds]) - NSHeight([topSeparatorView_ frame]);
+  CGFloat height = NSHeight([[self view] bounds]) -
+                   NSHeight([topSeparatorView_ frame]) - overlayContentsOffset_;
   switch (overlayHeightUnits_) {
     case INSTANT_SIZE_PERCENT:
       return std::min(height, (height * overlayHeight_) / 100);