Improve the names used in Mojo JS modules

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

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Generates JavaScript source files from a mojom.Module."""
 
 import mojom.generate.generator as generator
 import mojom.generate.module as mojom
 import mojom.generate.pack as pack
 from mojom.generate.template_expander import UseJinja
@@ skipping 257 matching lines @@
 
   @UseJinja("js_templates/module.html.tmpl", filters=js_filters)
   def GenerateHTMLModule(self):
     return self.GetParameters()
 
   def GenerateFiles(self, args):
     self.Write(self.GenerateAMDModule(), "%s.js" % self.module.name)
     self.Write(self.GenerateHTMLModule(), "%s.html" % self.module.name)
 
   def GetImports(self):
-    # Since each import is assigned a variable in JS, they need to have unique
-    # names.
-    counter = 1
-    for each in self.module.imports:
-      each["unique_name"] = "import" + str(counter)
+    used_names = set()
+    for each_import in self.module.imports:
+      simple_name = each_import["module_name"].split(".")[0]
+
+      # Since each import is assigned a variable in JS, they need to have unique
+      # names.
+      unique_name = simple_name
+      counter = 0
+      while unique_name in used_names:
+        counter += 1
+        unique_name = simple_name + str(counter)
+
+      used_names.add(unique_name)
+      each_import["unique_name"] = unique_name
       counter += 1
     return self.module.imports
 
   def GetImportedInterfaces(self):
     interface_to_import = {};
     for each_import in self.module.imports:
       for each_interface in each_import["module"].interfaces:
         name = each_interface.name
         interface_to_import[name] = each_import["unique_name"] + "." + name
     return interface_to_import;