Make it possibe to lock the fixedLayoutSize

Source/core/page/FrameView.cpp

Index: Source/core/page/FrameView.cpp
diff --git a/Source/core/page/FrameView.cpp b/Source/core/page/FrameView.cpp
index 8ed41521d20c67e53485fcd93b12ce409f7e4450..fa62e735c2ac54fe5b26d50cbf06f5a749d13776 100644
--- a/Source/core/page/FrameView.cpp
+++ b/Source/core/page/FrameView.cpp
@@ -2294,13 +2294,16 @@ void FrameView::autoSizeIfEnabled()
 
     IntSize size = frameRect().size();
 
+    const bool fixedWidthMode = m_minAutoSize.width() == m_maxAutoSize.width();
+    const int iterations = fixedWidthMode ? 1 : 2;
+
     // Do the resizing twice. The first time is basically a rough calculation using the preferred width
     // which may result in a height change during the second iteration.
-    for (int i = 0; i < 2; i++) {
+    for (int i = 0; i < iterations; i++) {
         // Update various sizes including contentsSize, scrollHeight, etc.
         document->updateLayoutIgnorePendingStylesheets();
-        int width = documentView->minPreferredLogicalWidth();
-        int height = documentRenderBox->scrollHeight();
+        int width = fixedWidthMode ? m_minAutoSize.width(): documentView->minPreferredLogicalWidth().toInt();
+        int height = fixedWidthMode ? 0 : documentRenderBox->scrollHeight();

[mkosiba (inactive), 2013/08/30 18:25:09]

ah, actually this should be
  fixedWidthMode ? m_minAutoSize.height() : ...
to support the case where we're in wrap_content mode but are sized to be bigger
than our content.

         IntSize newSize(width, height);
 
         // Check to see if a scrollbar is needed for a given dimension and
@@ -2352,6 +2355,7 @@ void FrameView::autoSizeIfEnabled()
             break;
 
         resize(newSize.width(), newSize.height());
+
         // Force the scrollbar state to avoid the scrollbar code adding them and causing them to be needed. For example,
         // a vertical scrollbar may cause text to wrap and thus increase the height (which is the only reason the scollbar is needed).
         setVerticalScrollbarLock(false);