Add HandleScopes and ScriptForbiddenScope::AllowUserAgentScript to private scripts

Source/bindings/templates/attributes.cpp

 {##############################################################################}
 {% macro attribute_getter(attribute, world_suffix) %}
 {% filter conditional(attribute.conditional_string) %}
 static void {{attribute.name}}AttributeGetter{{world_suffix}}(
 {%- if attribute.is_expose_js_accessors %}
 const v8::FunctionCallbackInfo<v8::Value>& info
 {%- else %}
 const v8::PropertyCallbackInfo<v8::Value>& info
 {%- endif %})
 {
@@ skipping 327 matching lines @@
 {% endfilter %}
 {% endmacro %}
 
 
 {##############################################################################}
 {% macro attribute_getter_implemented_in_private_script(attribute) %}
 bool {{v8_class}}::{{attribute.name}}AttributeGetterImplementedInPrivateScript(LocalFrame* frame, {{cpp_class}}* holderImpl, {{attribute.cpp_type}}* result)
 {
     if (!frame)
         return false;
+    v8::HandleScope handleScope(toIsolate(frame));
+    ScriptForbiddenScope::AllowUserAgentScript script;
     v8::Handle<v8::Context> context = toV8Context(frame, DOMWrapperWorld::privateScriptIsolatedWorld());
     if (context.IsEmpty())
         return false;
     ScriptState* scriptState = ScriptState::from(context);
     if (!scriptState->executionContext())
         return false;
 
     ScriptState::Scope scope(scriptState);
     v8::Handle<v8::Value> holder = toV8(holderImpl, scriptState->context()->Global(), scriptState->isolate());
 
@@ skipping 14 matching lines @@
     return true;
 }
 {% endmacro %}
 
 
 {% macro attribute_setter_implemented_in_private_script(attribute) %}
 bool {{v8_class}}::{{attribute.name}}AttributeSetterImplementedInPrivateScript(LocalFrame* frame, {{cpp_class}}* holderImpl, {{attribute.argument_cpp_type}} cppValue)
 {
     if (!frame)
         return false;
+    v8::HandleScope handleScope(toIsolate(frame));
+    ScriptForbiddenScope::AllowUserAgentScript script;
     v8::Handle<v8::Context> context = toV8Context(frame, DOMWrapperWorld::privateScriptIsolatedWorld());
     if (context.IsEmpty())
         return false;
     ScriptState* scriptState = ScriptState::from(context);
     if (!scriptState->executionContext())
         return false;
 
     ScriptState::Scope scope(scriptState);
     v8::Handle<v8::Value> holder = toV8(holderImpl, scriptState->context()->Global(), scriptState->isolate());
 
     ExceptionState exceptionState(ExceptionState::SetterContext, "{{attribute.name}}", "{{cpp_class}}", scriptState->context()->Global(), scriptState->isolate());
     v8::TryCatch block;
     V8RethrowTryCatchScope rethrow(block);
     PrivateScriptRunner::runDOMAttributeSetter(scriptState, "{{cpp_class}}", "{{attribute.name}}", holder, {{attribute.private_script_cpp_value_to_v8_value}});
     if (block.HasCaught()) {
         if (!PrivateScriptRunner::throwDOMExceptionInPrivateScriptIfNeeded(scriptState->isolate(), exceptionState, block.Exception())) {
             // FIXME: We should support exceptions other than DOM exceptions.
             RELEASE_ASSERT_NOT_REACHED();
         }
         return false;
     }
     return true;
 }
 {% endmacro %}