Create windows for new app window bounds API

apps/size_constraints.h

Index: apps/size_constraints.h
diff --git a/apps/size_constraints.h b/apps/size_constraints.h
index 1af269208dea9ef8116652f6df757c2068fe8a9e..353037bb46fd0e72fbf36c95449905446fecd97d 100644
--- a/apps/size_constraints.h
+++ b/apps/size_constraints.h
@@ -7,6 +7,10 @@
 
 #include "ui/gfx/geometry/size.h"
 
+namespace gfx {
+class Insets;
+}
+
 namespace apps {
 
 class SizeConstraints {
@@ -19,6 +23,10 @@ class SizeConstraints {
   SizeConstraints(const gfx::Size& min_size, const gfx::Size& max_size);
   ~SizeConstraints();
 
+  // Adds frame insets to a size constraint.
+  static gfx::Size AddFrameToConstraints(const gfx::Size& size_constraints,
+                                         const gfx::Insets& frame_insets);
+
   // Returns the bounds with its size clamped to the min/max size.
   gfx::Size ClampSize(gfx::Size size) const;