Add support for 'nocompile' to IDL schema compiler.

chrome/common/extensions/api/experimental_idltest.idl

Index: chrome/common/extensions/api/experimental_idltest.idl
diff --git a/chrome/common/extensions/api/experimental_idltest.idl b/chrome/common/extensions/api/experimental_idltest.idl
index bfecbd350a55e531b8f3330df8296f35a59c3d68..4ee9ff71c616010f7537361dbc532ddffd803150 100644
--- a/chrome/common/extensions/api/experimental_idltest.idl
+++ b/chrome/common/extensions/api/experimental_idltest.idl
@@ -21,6 +21,11 @@
     static void sendArrayBufferView([instanceOf=Uint8Array] object input,
                                     LongArrayCallback cb);
     static void getArrayBuffer(ArrayBufferCallback cb);
+
+    // This function should not have C++ code autogenerated (the variable name
+    // |switch| should cause compile errors if it does). But the name should
+    // get defined and made visible from within extensions/apps code.
+    [nocompile] static void nocompileFunc(long switch);
   };
 
 };