Fix mojom Java generator running on its own.

mojo/public/tools/bindings/generators/mojom_java_generator.py

Index: mojo/public/tools/bindings/generators/mojom_java_generator.py
diff --git a/mojo/public/tools/bindings/generators/mojom_java_generator.py b/mojo/public/tools/bindings/generators/mojom_java_generator.py
index 7df6358c786fe27e6c9a698d4725bdf36fdc7d0c..8b4fd25e0ce51a31782e485179dcc264ca5ff801 100644
--- a/mojo/public/tools/bindings/generators/mojom_java_generator.py
+++ b/mojo/public/tools/bindings/generators/mojom_java_generator.py
@@ -431,14 +431,16 @@ class Generator(generator.Generator):
           # Ignore errors on directory creation.
           pass
 
+    # Keep this above the others as .GetStructs() changes the state of the
+    # module, annotating structs with required information.
+    for struct in self.GetStructs():
+      self.Write(self.GenerateStructSource(struct),
+                 '%s.java' % GetNameForElement(struct))
+
     for enum in self.module.enums:
       self.Write(self.GenerateEnumSource(enum),
                  '%s.java' % GetNameForElement(enum))
 
-    for struct in self.module.structs:
-      self.Write(self.GenerateStructSource(struct),
-                 '%s.java' % GetNameForElement(struct))
-
     for interface in self.module.interfaces:
       self.Write(self.GenerateInterfaceSource(interface),
                  '%s.java' % GetNameForElement(interface))