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_;

[Robert Sesek, 2016/04/04 14:54:34]

Can you document what these variables are? It's not immediately clear what
wait_for_size_ means and how it affects the other state in this class.

Some of that commentary should also move up to the ctor comment or class comment
so users of this class know what to pass for wait_for_size.

[anthonyvd, 2016/04/04 20:35:24]

Done.

+  content::WebContents* host_web_contents_;
+  NSRect window_frame_;
+
   DISALLOW_COPY_AND_ASSIGN(SigninViewControllerDelegateMac);
 };