Enable the WebIDL [Exposed] annotation on an interface's members.

Source/bindings/scripts/code_generator_v8.py

Index: Source/bindings/scripts/code_generator_v8.py
diff --git a/Source/bindings/scripts/code_generator_v8.py b/Source/bindings/scripts/code_generator_v8.py
index 96db1d847470209808935713efd4bec0fccf2673..272b611c34fa69196540cdcf73c0a8ab0a1a0b36 100644
--- a/Source/bindings/scripts/code_generator_v8.py
+++ b/Source/bindings/scripts/code_generator_v8.py
@@ -239,11 +239,21 @@ def initialize_jinja_env(cache_dir):
     jinja_env.filters.update({
         'blink_capitalize': capitalize,
         'conditional': conditional_if_endif,
+        'exposed': exposed_if,
+        'per_context_enabled': per_context_enabled_if,
         'runtime_enabled': runtime_enabled_if,
         })
     return jinja_env
 
 
+def generate_indented_conditional(code, conditional):
+    # Indent if statement to level of original code
+    indent = re.match(' *', code).group(0)
+    return ('%sif (%s) {\n' % (indent, conditional) +
+            '    %s\n' % '\n    '.join(code.splitlines()) +
+            '%s}\n' % indent)
+
+
 # [Conditional]
 def conditional_if_endif(code, conditional_string):
     # Jinja2 filter to generate if/endif directive blocks
@@ -254,15 +264,25 @@ def conditional_if_endif(code, conditional_string):
             '#endif // %s\n' % conditional_string)
 
 
+# [Exposed]
+def exposed_if(code, exposed_test):
+    if not exposed_test:
+        return code
+    return generate_indented_conditional(code, 'context && (%s)' % exposed_test)
+
+
+# [PerContextEnabled]
+def per_context_enabled_if(code, per_context_enabled_function):
+    if not per_context_enabled_function:
+        return code
+    return generate_indented_conditional(code, 'context && context->isDocument() && %s(toDocument(context))' % per_context_enabled_function)
+
+
 # [RuntimeEnabled]
 def runtime_enabled_if(code, runtime_enabled_function_name):
     if not runtime_enabled_function_name:
         return code
-    # Indent if statement to level of original code
-    indent = re.match(' *', code).group(0)
-    return ('%sif (%s()) {\n' % (indent, runtime_enabled_function_name) +
-            '    %s\n' % '\n    '.join(code.splitlines()) +
-            '%s}\n' % indent)
+    return generate_indented_conditional(code, '%s()' % runtime_enabled_function_name)
 
 
 ################################################################################