[bindings] Implement an ExperimentEnabled IDL extended attribute.

third_party/WebKit/Source/bindings/tests/idls/core/TestObject.idl

Index: third_party/WebKit/Source/bindings/tests/idls/core/TestObject.idl
diff --git a/third_party/WebKit/Source/bindings/tests/idls/core/TestObject.idl b/third_party/WebKit/Source/bindings/tests/idls/core/TestObject.idl
index ec0fe4e21ffee7a47b9734e9d444408739094872..20df18b5d8cfb0d6266a024a6a5d09410e688bd2 100644
--- a/third_party/WebKit/Source/bindings/tests/idls/core/TestObject.idl
+++ b/third_party/WebKit/Source/bindings/tests/idls/core/TestObject.idl
@@ -67,6 +67,11 @@ interface TestObject {
     [RuntimeEnabled=FeatureName2] const short FEATURE2_ENABLED_CONST1 = 3;
     [RuntimeEnabled=FeatureName2] const short FEATURE2_ENABLED_CONST2 = 4;
     [RuntimeEnabled=FeatureName3] const short FEATURE3_ENABLED_CONST1 = 5;
+    [RuntimeEnabled=FeatureName1, APIExperimentEnabled=FeatureName1] const short FEATURE1_RUNTIME_AND_EXPERIMENT_ENABLED_CONST1 = 1;
+    [RuntimeEnabled=FeatureName1, APIExperimentEnabled=FeatureName1] const short FEATURE1_RUNTIME_AND_EXPERIMENT_ENABLED_CONST2 = 2;
+    [RuntimeEnabled=FeatureName2, APIExperimentEnabled=FeatureName2] const short FEATURE2_RUNTIME_AND_EXPERIMENT_ENABLED_CONST1 = 3;
+    [RuntimeEnabled=FeatureName2, APIExperimentEnabled=FeatureName2] const short FEATURE2_RUNTIME_AND_EXPERIMENT_ENABLED_CONST2 = 4;
+    [RuntimeEnabled=FeatureName3, APIExperimentEnabled=FeatureName3] const short FEATURE3_RUNTIME_AND_EXPERIMENT_ENABLED_CONST1 = 5;
     [Reflect=CONST_IMPL] const short CONST_JAVASCRIPT = 1;
 
     stringifier attribute DOMString stringifierAttribute;
@@ -191,6 +196,8 @@ interface TestObject {
     [CustomElementCallbacks] readonly attribute long customElementsCallbacksReadonlyLongAttribute;
     [DeprecateAs=LongAttribute] attribute long deprecatedLongAttribute;
     [EnforceRange] attribute long enforceRangeLongAttribute;
+    [APIExperimentEnabled=FeatureName, RuntimeEnabled=FeatureName] attribute long experimentRuntimeEnabledLongAttribute;
+    [APIExperimentEnabled=FeatureName, Conditional=CONDITION, RuntimeEnabled=FeatureName] attribute long experimentConditionalRuntimeEnabledLongAttribute;
     [ImplementedAs=implementedAsName] attribute long implementedAsLongAttribute;
     [Custom, ImplementedAs=implementedAsNameWithCustom] attribute long customImplementedAsLongAttribute;
     [Custom=Getter, ImplementedAs=implementedAsNameWithCustomGetter] attribute long customGetterImplementedAsLongAttribute;
@@ -263,6 +270,7 @@ interface TestObject {
     [Measure] attribute long measuredLongAttribute;
     [SameObject] attribute TestInterface sameObjectAttribute;
     [Unscopeable] attribute long unscopeableLongAttribute;
+    [Unscopeable, APIExperimentEnabled=FeatureName, RuntimeEnabled=FeatureName] attribute long unscopeableExperimentEnabledLongAttribute;
     [Unscopeable, RuntimeEnabled=FeatureName] attribute long unscopeableRuntimeEnabledLongAttribute;
     [Unscopeable] void unscopeableVoidMethod();
     [Unscopeable, RuntimeEnabled=FeatureName] void unscopeableRuntimeEnabledVoidMethod();
@@ -528,6 +536,14 @@ interface TestObject {
     [CustomElementCallbacks] void customElementCallbacksVoidMethod();
     [DeprecateAs=voidMethod] void deprecatedVoidMethod();
     [DoNotCheckSignature] void doNotCheckSignatureVoidMethod();
+    [APIExperimentEnabled=FeatureName, RuntimeEnabled=FeatureName1] void experimentEnabledVoidMethod();
+    [PerWorldBindings, APIExperimentEnabled=FeatureName, RuntimeEnabled=FeatureName1] void perWorldBindingsExperimentEnabledVoidMethod();
+    [APIExperimentEnabled=FeatureName, RuntimeEnabled=FeatureName1] void experimentEnabledOverloadedVoidMethod(DOMString stringArg);
+    [APIExperimentEnabled=FeatureName, RuntimeEnabled=FeatureName1] void experimentEnabledOverloadedVoidMethod(long longArg);
+    [APIExperimentEnabled=FeatureName1, RuntimeEnabled=FeatureName1] void partiallyExperimentEnabledOverloadedVoidMethod(DOMString stringArg);
+    [APIExperimentEnabled=FeatureName2, RuntimeEnabled=FeatureName1] void partiallyExperimentEnabledOverloadedVoidMethod(TestInterface testInterfaceArg);

[haraken, 2015/12/30 00:25:33]

If both [APIExperimentEnabled] and [RuntimeEnabled] are specified, the
[RuntimeEnabled] is just ignored, right?

If so, can we assert in the IDL compiler that it is invalid to specify the two
IDL attributes at the same time (and remove these test cases)?

[Daniel Nishi, 2015/12/30 22:05:50]

The [RuntimeEnabled] is used to generate the ExperimentalFeatures::%sEnabled
function, so we need to have both specified. I was unaware of this until I
looked at the generation patch that landed.

+     void partiallyExperimentEnabledOverloadedVoidMethod(long longArg, DOMString stringArg);
+    [APIExperimentEnabled=FeatureName3] void partiallyExperimentEnabledOverloadedVoidMethod(long longArg, DOMString stringArg, TestInterface testInterfaceArg);
     [ImplementedAs=implementedAsMethodName] void implementedAsVoidMethod();
     [MeasureAs=TestFeature] void measureAsVoidMethod();
     [Measure] void measureMethod();