Fix sizing issues in the tab modal signin flow.

chrome/browser/ui/cocoa/profiles/signin_view_controller_delegate_mac.h

Index: chrome/browser/ui/cocoa/profiles/signin_view_controller_delegate_mac.h
diff --git a/chrome/browser/ui/cocoa/profiles/signin_view_controller_delegate_mac.h b/chrome/browser/ui/cocoa/profiles/signin_view_controller_delegate_mac.h
index b1e9c1291b8a8403aa7ea6bbb21ec70f1255e912..b723fd0bde14364b693f854e36c920b9b0be8450 100644
--- a/chrome/browser/ui/cocoa/profiles/signin_view_controller_delegate_mac.h
+++ b/chrome/browser/ui/cocoa/profiles/signin_view_controller_delegate_mac.h
@@ -36,7 +36,8 @@ class SigninViewControllerDelegateMac : public ConstrainedWindowMacDelegate,
   SigninViewControllerDelegateMac(SigninViewController* signin_view_controller,
                                   scoped_ptr<content::WebContents> web_contents,
                                   content::WebContents* host_web_contents,
-                                  NSRect frame);
+                                  NSRect frame,
+                                  bool wait_for_size);
 
   static
   SigninViewControllerDelegateMac* CreateModalSigninDelegateWithNavigation(
@@ -61,6 +62,9 @@ class SigninViewControllerDelegateMac : public ConstrainedWindowMacDelegate,
 
  private:
   void PerformClose() override;
+  void ResizeNativeView(int height) override;
+
+  void DisplayModal();
 
   ~SigninViewControllerDelegateMac() override;
 
@@ -68,6 +72,10 @@ class SigninViewControllerDelegateMac : public ConstrainedWindowMacDelegate,
   scoped_ptr<content::WebContents> web_contents_;
   base::scoped_nsobject<ConstrainedWindowCustomWindow> window_;
 
+  bool wait_for_size_;
+  content::WebContents* host_web_contents_;
+  NSRect window_frame_;
+
   DISALLOW_COPY_AND_ASSIGN(SigninViewControllerDelegateMac);
 };