Mojo JS Bindings: add support for associative arrays (Mojo map type)

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

Index: mojo/public/tools/bindings/generators/mojom_js_generator.py
diff --git a/mojo/public/tools/bindings/generators/mojom_js_generator.py b/mojo/public/tools/bindings/generators/mojom_js_generator.py
index d05b7d3b77b54e687517cce1f7a98528a57d5a3f..7bb4b5da91ee189003c58c844f368f6e20f64658 100644
--- a/mojo/public/tools/bindings/generators/mojom_js_generator.py
+++ b/mojo/public/tools/bindings/generators/mojom_js_generator.py
@@ -54,6 +54,8 @@ def JavaScriptDefaultValue(field):
     return "null"
   if mojom.IsAnyArrayKind(field.kind):
     return "null"
+  if mojom.IsMapKind(field.kind):
+    return "null"
   if mojom.IsInterfaceKind(field.kind) or \
      mojom.IsInterfaceRequestKind(field.kind):
     return _kind_to_javascript_default_value[mojom.MSGPIPE]
@@ -116,12 +118,17 @@ def CodecType(kind):
     return _kind_to_codec_type[mojom.INT32]
   return kind
 
+def MapCodecType(kind):
+  return "codec.PackedBool" if mojom.IsBoolKind(kind) else CodecType(kind)
 
 def JavaScriptDecodeSnippet(kind):
   if kind in mojom.PRIMITIVES:
     return "decodeStruct(%s)" % CodecType(kind)
   if mojom.IsStructKind(kind):
     return "decodeStructPointer(%s)" % JavaScriptType(kind)
+  if mojom.IsMapKind(kind):
+    return "decodeMapPointer(%s, %s)" % \
+        (MapCodecType(kind.key_kind), MapCodecType(kind.value_kind))
   if mojom.IsAnyArrayKind(kind) and mojom.IsBoolKind(kind.kind):
     return "decodeArrayPointer(codec.PackedBool)"
   if mojom.IsAnyArrayKind(kind):
@@ -137,6 +144,9 @@ def JavaScriptEncodeSnippet(kind):
     return "encodeStruct(%s, " % CodecType(kind)
   if mojom.IsStructKind(kind):
     return "encodeStructPointer(%s, " % JavaScriptType(kind)
+  if mojom.IsMapKind(kind):
+    return "encodeMapPointer(%s, %s, " % \
+        (MapCodecType(kind.key_kind), MapCodecType(kind.value_kind))
   if mojom.IsAnyArrayKind(kind) and mojom.IsBoolKind(kind.kind):
     return "encodeArrayPointer(codec.PackedBool, ";
   if mojom.IsAnyArrayKind(kind):