Add primaryFont ASSERT to LayoutTextControl::getAvgCharWidth

third_party/WebKit/Source/core/layout/LayoutTextControl.cpp

 /**
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  *           (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 192 matching lines @@
 
         for (size_t i = 0; i < WTF_ARRAY_LENGTH(fontFamiliesWithInvalidCharWidth); ++i)
             fontFamiliesWithInvalidCharWidthMap->add(AtomicString(fontFamiliesWithInvalidCharWidth[i]));
     }
 
     return !fontFamiliesWithInvalidCharWidthMap->contains(family);
 }
 
 float LayoutTextControl::getAvgCharWidth(const AtomicString& family) const
 {
-    if (hasValidAvgCharWidth(family))
-        return roundf(style()->font().primaryFont()->avgCharWidth());
+    const Font& font = style()->font();
+    if (hasValidAvgCharWidth(family)) {
+        ASSERT(font.primaryFont());
+        return roundf(font.primaryFont()->avgCharWidth());
+    }
 
     const UChar ch = '0';
     const String str = String(&ch, 1);
-    const Font& font = style()->font();
     TextRun textRun = constructTextRun(font, str, styleRef(), TextRun::AllowTrailingExpansion);
     return font.width(textRun);
 }
 
 float LayoutTextControl::scaleEmToUnits(int x) const
 {
     // This matches the unitsPerEm value for MS Shell Dlg and Courier New from the "head" font table.
     float unitsPerEm = 2048.0f;
     return roundf(style()->font().fontDescription().computedSize() * x / unitsPerEm);
 }
@@ skipping 50 matching lines @@
     HTMLElement* placeholder = toHTMLTextFormControlElement(node())->placeholderElement();
     LayoutObject* placeholderLayoutObject = placeholder ? placeholder->layoutObject() : nullptr;
     if (!placeholderLayoutObject)
         return nullptr;
     if (relayoutChildren)
         layoutScope.setChildNeedsLayout(placeholderLayoutObject);
     return placeholderLayoutObject;
 }
 
 } // namespace blink