mandoline sandbox: prewarm libraries before we raise the sandbox.

mojo/runner/android/main.cc

Index: mojo/runner/android/main.cc
diff --git a/mojo/runner/android/main.cc b/mojo/runner/android/main.cc
index c395dfa0037012cefffcca96cbe1b82cb32f72dd..024405f86dc8825586fff4793a24cccdfe8e0d23 100644
--- a/mojo/runner/android/main.cc
+++ b/mojo/runner/android/main.cc
@@ -28,6 +28,8 @@
 #include "mojo/runner/child_process.h"
 #include "mojo/runner/context.h"
 #include "mojo/runner/init.h"
+#include "mojo/runner/native_application_support.h"
+#include "mojo/runner/switches.h"
 #include "mojo/shell/application_loader.h"
 #include "ui/gl/gl_surface_egl.h"
 
@@ -185,5 +187,15 @@ int main(int argc, char** argv) {
   base::CommandLine::Init(argc, argv);
 
   mojo::runner::InitializeLogging();
-  return mojo::runner::ChildProcessMain();
+
+  const base::CommandLine& command_line =
+      *base::CommandLine::ForCurrentProcess();
+  CHECK(command_line.HasSwitch(switches::kChildProcess));
+  mojo::shell::NativeApplicationCleanup cleanup =
+      command_line.HasSwitch(switches::kDeleteAfterLoad)
+          ? mojo::shell::NativeApplicationCleanup::DELETE
+          : mojo::shell::NativeApplicationCleanup::DONT_DELETE;
+  base::NativeLibrary app_library = mojo::runner::LoadNativeApplication(
+      command_line.GetSwitchValuePath(switches::kChildProcess), cleanup);
+  return mojo::runner::ChildProcessMain(app_library);
 }