Split content script injections into multiple tasks

third_party/WebKit/public/web/WebLocalFrame.h

Index: third_party/WebKit/public/web/WebLocalFrame.h
diff --git a/third_party/WebKit/public/web/WebLocalFrame.h b/third_party/WebKit/public/web/WebLocalFrame.h
index 31919e7d86acd39f19a9f51d9be18175eac62761..4178982550df5913f91a14be9925e9eeef221364 100644
--- a/third_party/WebKit/public/web/WebLocalFrame.h
+++ b/third_party/WebKit/public/web/WebLocalFrame.h
@@ -232,6 +232,15 @@ class WebLocalFrame : public WebFrame {
                                         v8::Local<v8::Value> argv[],
                                         WebScriptExecutionCallback*) = 0;
 
+  enum ScriptExecutionType {
+    // Execute script synchronously if possible.
+    Synchronous,
+    // Execute script asynchronously.
+    Asynchronous,
+    // Execute script asynchronously, blocking the window.onload event.
+    AsyncBlockingOnload
+  };
+
   // worldID must be > 0 (as 0 represents the main world).
   // worldID must be < EmbedderWorldIdLimit, high number used internally.
   virtual void requestExecuteScriptInIsolatedWorld(
@@ -239,6 +248,7 @@ class WebLocalFrame : public WebFrame {
       const WebScriptSource* sourceIn,
       unsigned numSources,
       bool userGesture,
+      ScriptExecutionType,
       WebScriptExecutionCallback*) = 0;
 
   // Associates an isolated world with human-readable name which is useful for