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..18a6e6342d444a30ffc612371d130f6ca6d1ef7d 100644
--- a/extensions/shell/app/shell_main.cc
+++ b/extensions/shell/app/shell_main.cc
@@ -10,23 +10,36 @@
 #include "sandbox/win/src/sandbox_types.h"
 #endif
 
-#if defined(OS_WIN)
-int APIENTRY wWinMain(HINSTANCE instance, HINSTANCE, wchar_t*, int) {
-#else
-int main(int argc, const char** argv) {
+#if defined(OS_MACOSX)
+#include "extensions/shell/app/shell_main_mac.h"
 #endif
+
+#if defined(OS_MACOSX)
+int main(int argc, const char** argv) {
+  // Do the delegate work in shell_main_mac to avoid having to export the
+  // delegate types.
+  return ::ContentMain(argc, argv);
+}
+#elif defined(OS_WIN)
+int APIENTRY wWinMain(HINSTANCE instance, HINSTANCE, wchar_t*, int) {
   extensions::ShellMainDelegate delegate;
   content::ContentMainParams params(&delegate);
 
-#if defined(OS_WIN)
   sandbox::SandboxInterfaceInfo sandbox_info = {0};
   content::InitializeSandboxInfo(&sandbox_info);
   params.instance = instance;
   params.sandbox_info = &sandbox_info;
-#else
+
+  return content::ContentMain(params);
+}
+#else  // non-Mac POSIX
+int main(int argc, const char** argv) {
+  extensions::ShellMainDelegate delegate;
+  content::ContentMainParams params(&delegate);
+
   params.argc = argc;
   params.argv = argv;
-#endif
 
   return content::ContentMain(params);
 }
+#endif