[MacViews] Implement size constraints for app windows.

ui/views/widget/native_widget_mac.mm

Index: ui/views/widget/native_widget_mac.mm
diff --git a/ui/views/widget/native_widget_mac.mm b/ui/views/widget/native_widget_mac.mm
index eaad5c99e7634d52f00938be3178683009346bfc..3ab80874b11adcee58254d25da59172dd4847f7c 100644
--- a/ui/views/widget/native_widget_mac.mm
+++ b/ui/views/widget/native_widget_mac.mm
@@ -22,6 +22,9 @@
 namespace views {
 namespace {
 
+// The value used to represent an unbounded width or height.
+const int kUnboundedSize = 0;
+
 NSInteger StyleMaskForParams(const Widget::InitParams& params) {
   // TODO(tapted): Determine better masks when there are use cases for it.
   if (params.remove_standard_frame)
@@ -526,7 +529,19 @@ bool NativeWidgetMac::IsTranslucentWindowOpacitySupported() const {
 }
 
 void NativeWidgetMac::OnSizeConstraintsChanged() {

[tapted, 2015/03/20 12:12:53]

Aura widgets also call this towards the end of InitNativeWidget() -- is that
needed?

[jackhou1, 2015/03/25 23:32:23]

ChromeNativeAppWindowViews::InitializeDefaultWindow() calls
SetContentSizeConstraints(). But it might be needed for non-app-window widgets.
Added call in NativeWidgetMac::InitNativeWidget.

-  NOTIMPLEMENTED();
+  NSWindow* window = GetNativeWindow();
+  gfx::Size minimum_size = delegate()->GetMinimumSize();
+  [window setContentMinSize:NSMakeSize(minimum_size.width(),
+                                       minimum_size.height())];
+
+  gfx::Size maximum_size = delegate()->GetMaximumSize();
+  CGFloat max_width = maximum_size.width() == kUnboundedSize
+                          ? CGFLOAT_MAX
+                          : maximum_size.width();
+  CGFloat max_height = maximum_size.height() == kUnboundedSize
+                           ? CGFLOAT_MAX
+                           : maximum_size.height();
+  [window setContentMaxSize:NSMakeSize(max_width, max_height)];
 }
 
 void NativeWidgetMac::RepostNativeEvent(gfx::NativeEvent native_event) {