AppShell support for Mac.

extensions/shell/app/shell_main.cc

Index: extensions/shell/app/shell_main.cc
diff --git a/extensions/shell/app/shell_main.cc b/extensions/shell/app/shell_main.cc
index a58ab82d7e17bf4d333920c94977e48bfd937c55..4d02f382561fa3646447a468f77abf939aaa17e7 100644
--- a/extensions/shell/app/shell_main.cc
+++ b/extensions/shell/app/shell_main.cc
@@ -10,11 +10,20 @@
 #include "sandbox/win/src/sandbox_types.h"
 #endif
 
+#if defined(OS_MACOSX)
+#include "extensions/shell/app/shell_main_mac.h"
+#endif
+
 #if defined(OS_WIN)
 int APIENTRY wWinMain(HINSTANCE instance, HINSTANCE, wchar_t*, int) {
 #else
 int main(int argc, const char** argv) {
 #endif
+#if defined(OS_MACOSX)
+  // Do the delegate work in shell_main_mac to avoid having to export the
+  // delegate types.
+  return ::ContentMain(argc, argv);
+#else
   extensions::ShellMainDelegate delegate;
   content::ContentMainParams params(&delegate);
 
@@ -26,7 +35,8 @@ int main(int argc, const char** argv) {
 #else
   params.argc = argc;
   params.argv = argv;
-#endif
+#endif  // OS_WIN
 
   return content::ContentMain(params);
+#endif  // OS_MACOSX
 }