[Origin Trials] Install origin trial bindings on V8 context conditionally

third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h

Index: third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h
diff --git a/third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h b/third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h
index f22e8a86a3d3003756961bdf0db550ade8df573f..0d4c5f1c0860dafc3824e55c4b135207e5d91a6c 100644
--- a/third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h
+++ b/third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h
@@ -72,6 +72,13 @@ public:
     // token validator object that is normally used (e.g. for testing).
     bool isFeatureEnabled(const String& featureName, String* errorMessage, WebTrialTokenValidator* = nullptr);
 
+    // Installs JavaScript bindings for any features which should be enabled by
+    // the current set of trial tokens. This method is idempotent; only features
+    // which have been enabled since the last time it was run will be installed.
+    // If the V8 context for the host execution context has not been
+    // initialized, then this method will return without doing anything.
+    void initializePendingTrials();
+
     void setFeatureBindingsInstalled(const String& featureName);
     bool featureBindingsInstalled(const String& featureName);