Move MainWorldScriptContext accessor/method from WebFrame to WebLocalFrame.

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 0e7ac509b37c9af1e6e7ed4a096fc5fb367d95a6..1a526cfd0997c66e0ebd05784d171e5d4943ff5f 100644
--- a/third_party/WebKit/public/web/WebLocalFrame.h
+++ b/third_party/WebKit/public/web/WebLocalFrame.h
@@ -19,6 +19,14 @@ namespace base {
 class SingleThreadTaskRunner;
 }
 
+namespace v8 {
+class Context;
+class Function;

[dcheng, 2017/06/06 19:57:17]

I think we only need v8::Local and Context for now... but I think it would
better to just #include "v8/include/v8.h".

[Łukasz Anforowicz, 2017/06/07 20:35:07]

Done (here and also in WebFrame.h which would otherwise require
forward-declaring v8::Object for GlobalProxy method's return type).

+class Value;
+template <class T>
+class Local;
+}
+
 namespace blink {
 
 class InterfaceProvider;
@@ -270,6 +278,13 @@ class WebLocalFrame : public WebFrame {
   // Executes script in the context of the current page.
   virtual void ExecuteScript(const WebScriptSource&) = 0;
 
+  // Returns the V8 context for associated with the main world and this
+  // frame. There can be many V8 contexts associated with this frame, one for
+  // each isolated world and one for the main world. If you don't know what
+  // the "main world" or an "isolated world" is, then you probably shouldn't
+  // be calling this API.
+  virtual v8::Local<v8::Context> MainWorldScriptContext() const = 0;
+
   // Executes script in the context of the current page and returns the value
   // that the script evaluated to with callback. Script execution can be
   // suspend.