Add hasCommittedRealDocument API to WebFrame.

public/web/WebFrame.h

Index: public/web/WebFrame.h
diff --git a/public/web/WebFrame.h b/public/web/WebFrame.h
index 211def68aed06bc968232765d3d6b6d4962f7ed1..0fe5b1f941693b46a4d7c27afb17b4fac9dd5fd5 100644
--- a/public/web/WebFrame.h
+++ b/public/web/WebFrame.h
@@ -349,6 +349,9 @@ public:
     // Stops any pending loads on the frame and its children.
     virtual void stopLoading() = 0;
 
+    // Returns true if the current frame has committed the first real document.
+    virtual bool hasCommittedRealDocument() const = 0;

[darin (slow to review), 2013/09/20 22:03:04]

Note: On the Chromium side, you could also just keep track of whether or not you
ever received a DidCommitProvisionalLoad for this WebFrame. That is not sent
when we load the initial empty document.

See the implementation of FrameLoader::receivedFirstData().

+
     // Returns the data source that is currently loading.  May be null.
     virtual WebDataSource* provisionalDataSource() const = 0;