[Mac] Port browser action popup test to mac.

chrome/browser/cocoa/extensions/extension_popup_controller.mm

Index: chrome/browser/cocoa/extensions/extension_popup_controller.mm
===================================================================
--- chrome/browser/cocoa/extensions/extension_popup_controller.mm	(revision 34954)
+++ chrome/browser/cocoa/extensions/extension_popup_controller.mm	(working copy)
@@ -190,4 +190,21 @@
   [[self window] makeKeyAndOrderFront:self];
 }
 
+// Private (TestingAPI)
+- (NSView*)view {
+  return extensionView_;
+}
+
+// Private (TestingAPI)
++ (NSSize)minPopupSize {
+  NSSize minSize = {kMinWidth, kMinHeight};
+  return minSize;
+}
+
+// Private (TestingAPI)
++ (NSSize)maxPopupSize {
+  NSSize maxSize = {kMaxWidth, kMaxHeight};
+  return maxSize;
+}
+
 @end