TextAutosizer: unlock multipliers on DOMContentLoaded.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index e8ef2cf7c438b303bde920dd19ce242e5aec7fab..66867199120831c94a4cc338769b1a0d67c76290 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -4426,6 +4426,14 @@ void Document::finishedParsing()
     if (!m_documentTiming.domContentLoadedEventEnd)
         m_documentTiming.domContentLoadedEventEnd = monotonicallyIncreasingTime();
 
+    if (frame() && frame()->isMainFrame()) {
+        // Reset the text autosizing multipliers on main frame when DOM is loaded.
+        // This is to allow for a fresh text autosizing pass when the page layout

[skobes, 2014/03/11 17:47:58]

I'm confused here - the autosizer is called by layout().  How is it possible for
layout to "change significantly" without re-running it?

[timvolodine, 2014/03/11 17:57:05]

Yes, what I meant is to allow for a fresh autosizing pass when the layout is
executed after Document::finishedParsing is called..
This is needed for pages which load tables mixed with javascript inside them
e.g. drudgereport and the canonical test I have included.

[skobes, 2014/03/11 19:30:22]

I see, this is because you don't allow the multiplier to change after it's been
set.

I wonder if we need to duplicate this in FTA... currently we don't lock
multipliers.

+        // changes significantly in the end.
+        if (TextAutosizer* textAutosizer = this->textAutosizer())
+            textAutosizer->recalculateMultipliers();
+    }
+
     // The loader's finishedParsing() method may invoke script that causes this object to
     // be dereferenced (when this document is in an iframe and the onload causes the iframe's src to change).
     // Keep it alive until we are done.