[bindings] Implement an ExperimentEnabled IDL extended attribute.

third_party/WebKit/Source/bindings/scripts/v8_interface.py

Index: third_party/WebKit/Source/bindings/scripts/v8_interface.py
diff --git a/third_party/WebKit/Source/bindings/scripts/v8_interface.py b/third_party/WebKit/Source/bindings/scripts/v8_interface.py
index 95bebe6d73e6bad0083dace58c3c811477425eee..5e22ef0dfb19034ef4d06992fc24d0e68d98e5f5 100644
--- a/third_party/WebKit/Source/bindings/scripts/v8_interface.py
+++ b/third_party/WebKit/Source/bindings/scripts/v8_interface.py
@@ -46,7 +46,7 @@ import v8_methods
 import v8_types
 from v8_types import cpp_ptr_type, cpp_template_type
 import v8_utilities
-from v8_utilities import (cpp_name_or_partial, capitalize, conditional_string, cpp_name, gc_type,
+from v8_utilities import (api_experiment_enabled_function, cpp_name_or_partial, capitalize, conditional_string, cpp_name, gc_type,
                           has_extended_attribute_value, runtime_enabled_function_name,
                           extended_attribute_value_as_list, is_legacy_interface_type_checking)
 
@@ -162,7 +162,12 @@ def interface_context(interface):
     cpp_class_name_or_partial = cpp_name_or_partial(interface)
     v8_class_name_or_partial = v8_utilities.v8_class_name_or_partial(interface)
 
+    if 'APIExperimentEnabled' in extended_attributes:
+        includes.add('core/experiments/ExperimentalFeatures.h')
+        includes.add('core/inspector/ConsoleMessage.h')
+
     context = {
+        'api_experiment_name': v8_utilities.api_experiment_name(interface),
         'conditional_string': conditional_string(interface),  # [Conditional]
         'cpp_class': cpp_class_name,
         'cpp_class_or_partial': cpp_class_name_or_partial,
@@ -261,7 +266,7 @@ def interface_context(interface):
     constant_configuration_constants = []
 
     for constant in constants:
-        if constant['measure_as'] or constant['deprecate_as']:
+        if constant['measure_as'] or constant['deprecate_as'] or constant['api_experiment_name']:
             special_getter_constants.append(constant)
             continue
         runtime_enabled_function = constant['runtime_enabled_function']
@@ -606,10 +611,19 @@ def interface_context(interface):
 # [DeprecateAs], [Reflect], [RuntimeEnabled]
 def constant_context(constant, interface):
     extended_attributes = constant.extended_attributes
+
+    if 'APIExperimentEnabled' in extended_attributes:
+        includes.add('core/experiments/ExperimentalFeatures.h')
+        includes.add('core/inspector/ConsoleMessage.h')
+
     return {
+        'api_experiment_enabled': v8_utilities.api_experiment_enabled_function(constant),  # [APIExperimentEnabled]
+        'api_experiment_enabled_per_interface': v8_utilities.api_experiment_enabled_function(interface),  # [APIExperimentEnabled]
+        'api_experiment_name': extended_attributes.get('APIExperimentEnabled'),  # [APIExperimentEnabled]
         'cpp_class': extended_attributes.get('PartialInterfaceImplementedAs'),
         'deprecate_as': v8_utilities.deprecate_as(constant),  # [DeprecateAs]
         'idl_type': constant.idl_type.name,
+        'is_api_experiment_enabled': v8_utilities.api_experiment_enabled_function(constant) or v8_utilities.api_experiment_enabled_function(interface),  # [APIExperimentEnabled]
         'measure_as': v8_utilities.measure_as(constant, interface),  # [MeasureAs]
         'name': constant.name,
         # FIXME: use 'reflected_name' as correct 'name'