Update mojo sdk to rev e7270700d671fa8e458b4d8c9e47f7bcfb65da0b

third_party/mojo/src/mojo/public/tools/bindings/generators/mojom_dart_generator.py

Index: third_party/mojo/src/mojo/public/tools/bindings/generators/mojom_dart_generator.py
diff --git a/third_party/mojo/src/mojo/public/tools/bindings/generators/mojom_dart_generator.py b/third_party/mojo/src/mojo/public/tools/bindings/generators/mojom_dart_generator.py
index 9d2fafef9754ac872d897e58ead173fd24ac041d..ac27fa1d3dde84a5e6a403d43350f0ca40d31172 100644
--- a/third_party/mojo/src/mojo/public/tools/bindings/generators/mojom_dart_generator.py
+++ b/third_party/mojo/src/mojo/public/tools/bindings/generators/mojom_dart_generator.py
@@ -360,7 +360,7 @@ def IsPointerArrayKind(kind):
 def GetImportUri(module):
   elements = module.namespace.split('.')
   elements.append("%s" % module.name)
-  return os.path.join(*elements)
+  return os.path.join("mojom", *elements)
 
 class Generator(generator.Generator):
 
@@ -402,17 +402,24 @@ class Generator(generator.Generator):
   def GenerateFiles(self, args):
     elements = self.module.namespace.split('.')
     elements.append("%s.dart" % self.module.name)
-    path = os.path.join("dart-gen", *elements)
+    path = os.path.join("dart-gen", "mojom", *elements)
     self.Write(self.GenerateLibModule(args), path)
     link = self.MatchMojomFilePath("%s.dart" % self.module.name)
     if os.path.exists(os.path.join(self.output_dir, link)):
       os.unlink(os.path.join(self.output_dir, link))
-    if sys.platform == "win32":
-      shutil.copy(os.path.join(self.output_dir, path),
-                  os.path.join(self.output_dir, link))
-    else:
-      os.symlink(os.path.join(self.output_dir, path),
-                 os.path.join(self.output_dir, link))
+    try:
+      if sys.platform == "win32":
+        shutil.copy(os.path.join(self.output_dir, path),
+                    os.path.join(self.output_dir, link))
+      else:
+        os.symlink(os.path.join(self.output_dir, path),
+                   os.path.join(self.output_dir, link))
+    except OSError as e:
+      # Errno 17 is file already exists. If the link fails because file already
+      # exists assume another instance of this script tried to create the same
+      # file and continue on.
+      if e.errno != 17:
+        raise e
 
   def GetImports(self, args):
     used_names = set()