Make it possibe to lock the fixedLayoutSize

public/web/WebView.h

 /*
  * Copyright (C) 2009, 2010, 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
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  *     * Redistributions in binary form must reproduce the above
@@ skipping 296 matching lines @@
 
     // In fixed layout mode, the layout of the page is independent of the
     // view port size, given by WebWidget::size().
 
     virtual bool isFixedLayoutModeEnabled() const = 0;
     virtual void enableFixedLayoutMode(bool enable) = 0;
 
     virtual WebSize fixedLayoutSize() const = 0;
     virtual void setFixedLayoutSize(const WebSize&) = 0;
 
+    virtual void setFixedLayoutSizeLock(bool) = 0;

[aelias_OOO_until_Jul13, 2013/09/06 23:11:18]

I looked at this more carefully and you don't need to add this new API.  Just
change the meaning of WebView::setFixedLayoutSize().  It has no real callers on
any platform at the moment.

When a Chromium-side caller calls setFixedLayoutSize, set your lock bool and the
FrameView fixedLayoutSize.  Clear the bool if it's called with WebSize(0,0).

And change the last line of WebViewImpl::updatePageDefinedPageScaleConstraints
to stop calling the API method and do instead:

if (!fixedLayoutSizeLock())
  frame->view()->setFixedLayoutSize(layoutSize);

So I'm proposing to redefine the concept of "fixed layout" to fit your use case
and mean literally that, the layout size is fixed from Chromium separately from
the view size and Blink never spontaneously changes it.

[mkosiba (inactive), 2013/09/10 09:11:31]

ah, cool!
Thanks for looking. I keep forgetting that these APIs might have been added for 
a different WebKit port and the fact that they're public doesn't neccessarily
mean that they're used in Chrome.

 
     // Auto-Resize -----------------------------------------------------------
 
     // In auto-resize mode, the view is automatically adjusted to fit the html
     // content within the given bounds.
     virtual void enableAutoResizeMode(
         const WebSize& minSize,
         const WebSize& maxSize) = 0;
 
     // Turn off auto-resize.
@@ skipping 191 matching lines @@
 
     // Testing functionality for TestRunner ---------------------------------
 
 protected:
     ~WebView() {}
 };
 
 } // namespace WebKit
 
 #endif