Allow origin trials to be enabled by script

third_party/WebKit/Source/bindings/core/v8/ConditionalFeatures.cpp

Index: third_party/WebKit/Source/bindings/core/v8/ConditionalFeatures.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/ConditionalFeatures.cpp b/third_party/WebKit/Source/bindings/core/v8/ConditionalFeatures.cpp
index 6b28b52df4953a008dc110c22f6ab41c6b32a6e6..8f3a147dbdcbab0d1e2c8b615833f4d794ccbebd 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ConditionalFeatures.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/ConditionalFeatures.cpp
@@ -11,7 +11,7 @@
 #include "bindings/core/v8/V8Window.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/frame/LocalFrame.h"
-#include "core/origin_trials/OriginTrialContext.h"
+#include "core/origin_trials/OriginTrials.h"
 
 namespace blink {
 
@@ -25,40 +25,73 @@ void installConditionalFeaturesCore(const WrapperTypeInfo* wrapperTypeInfo,
   ExecutionContext* executionContext = scriptState->getExecutionContext();
   if (!executionContext)
     return;
-  OriginTrialContext* originTrialContext = OriginTrialContext::from(
-      executionContext, OriginTrialContext::DontCreateIfNotExists);
   v8::Isolate* isolate = scriptState->isolate();
   const DOMWrapperWorld& world = scriptState->world();
   if (wrapperTypeInfo == &V8HTMLLinkElement::wrapperTypeInfo) {
-    if (RuntimeEnabledFeatures::linkServiceWorkerEnabled() ||
-        (originTrialContext &&
-         originTrialContext->isTrialEnabled("ForeignFetch"))) {
+    if (OriginTrials::linkServiceWorkerEnabled(executionContext)) {
       V8HTMLLinkElement::installLinkServiceWorker(
           isolate, world, v8::Local<v8::Object>(), prototypeObject,
           interfaceObject);
     }
   } else if (wrapperTypeInfo == &V8Window::wrapperTypeInfo) {
     v8::Local<v8::Object> instanceObject = scriptState->context()->Global();
-    if (RuntimeEnabledFeatures::longTaskObserverEnabled() ||
-        (originTrialContext &&
-         originTrialContext->isTrialEnabled("LongTaskObserver"))) {
+    if (OriginTrials::longTaskObserverEnabled(executionContext)) {
       V8Window::installLongTaskObserver(isolate, world, instanceObject,
                                         prototypeObject, interfaceObject);
     }
   } else if (wrapperTypeInfo == &V8Document::wrapperTypeInfo) {
-    if (RuntimeEnabledFeatures::setRootScrollerEnabled() ||
-        (originTrialContext &&
-         originTrialContext->isTrialEnabled("RootScroller"))) {
+    if (OriginTrials::setRootScrollerEnabled(executionContext)) {
       V8Document::installRootScroller(isolate, world, v8::Local<v8::Object>(),
                                       prototypeObject, interfaceObject);
     }
   }
 }
 
+void installPendingConditionalFeatureCore(const String& feature,
+                                          const ScriptState* scriptState) {
+  // TODO(iclelland): Generate all of this logic at compile-time, based on the
+  // configuration of origin trial enabled attributes and interfaces in IDL
+  // files. (crbug.com/615060)
+  v8::Local<v8::Object> prototypeObject;
+  v8::Local<v8::Function> interfaceObject;
+  v8::Isolate* isolate = scriptState->isolate();
+  const DOMWrapperWorld& world = scriptState->world();
+  V8PerContextData* contextData = scriptState->perContextData();
+  if (feature == "ForeignFetch") {
+    if (contextData->getExistingConstructorAndPrototypeForType(
+            &V8HTMLLinkElement::wrapperTypeInfo, &prototypeObject,
+            &interfaceObject)) {
+      V8HTMLLinkElement::installLinkServiceWorker(
+          isolate, world, v8::Local<v8::Object>(), prototypeObject,
+          interfaceObject);
+    }
+    return;
+  }
+  if (feature == "LongTaskObserver") {
+    v8::Local<v8::Object> instanceObject = scriptState->context()->Global();
+    V8Window::installLongTaskObserver(isolate, world, instanceObject,
+                                      v8::Local<v8::Object>(),
+                                      v8::Local<v8::Function>());
+    return;
+  }
+  if (feature == "RootScroller") {
+    if (contextData->getExistingConstructorAndPrototypeForType(
+            &V8Document::wrapperTypeInfo, &prototypeObject, &interfaceObject)) {
+      V8Document::installRootScroller(isolate, world, v8::Local<v8::Object>(),
+                                      prototypeObject, interfaceObject);
+    }
+    return;
+  }
+}
+
 namespace {
 
 InstallConditionalFeaturesFunction s_installConditionalFeaturesFunction =
     &installConditionalFeaturesCore;
+
+InstallPendingConditionalFeatureFunction
+    s_installPendingConditionalFeatureFunction =
+        &installPendingConditionalFeatureCore;
 }
 
 InstallConditionalFeaturesFunction setInstallConditionalFeaturesFunction(
@@ -69,6 +102,17 @@ InstallConditionalFeaturesFunction setInstallConditionalFeaturesFunction(
   return originalFunction;
 }
 
+InstallPendingConditionalFeatureFunction
+setInstallPendingConditionalFeatureFunction(
+    InstallPendingConditionalFeatureFunction
+        newInstallPendingConditionalFeatureFunction) {
+  InstallPendingConditionalFeatureFunction originalFunction =
+      s_installPendingConditionalFeatureFunction;
+  s_installPendingConditionalFeatureFunction =
+      newInstallPendingConditionalFeatureFunction;
+  return originalFunction;
+}
+
 void installConditionalFeatures(const WrapperTypeInfo* type,
                                 const ScriptState* scriptState,
                                 v8::Local<v8::Object> prototypeObject,
@@ -77,7 +121,7 @@ void installConditionalFeatures(const WrapperTypeInfo* type,
                                           interfaceObject);
 }
 
-void installPendingConditionalFeaturesOnWindow(const ScriptState* scriptState) {
+void installConditionalFeaturesOnWindow(const ScriptState* scriptState) {
   DCHECK(scriptState);
   DCHECK(scriptState->context() == scriptState->isolate()->GetCurrentContext());
   DCHECK(scriptState->perContextData());
@@ -87,6 +131,16 @@ void installPendingConditionalFeaturesOnWindow(const ScriptState* scriptState) {
                                           v8::Local<v8::Function>());
 }
 
+void installPendingConditionalFeature(const String& feature,
+                                      const ScriptState* scriptState) {
+  DCHECK(scriptState);
+  DCHECK(scriptState->context() == scriptState->isolate()->GetCurrentContext());
+  DCHECK(scriptState->perContextData());
+  DCHECK(scriptState->world().isMainWorld());
+
+  (*s_installPendingConditionalFeatureFunction)(feature, scriptState);
+}
+
 bool isFeatureEnabledInFrame(const FeaturePolicy::Feature& feature,
                              const LocalFrame* frame) {
   // If there is no frame, or if feature policy is disabled, use defaults.