Skip canvas filter construction in frameless documents

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  * Copyright (C) 2012, 2013 Intel Corporation. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
@@ skipping 364 matching lines @@
     return state().hasFilter(canvas(), canvas()->size(), this);
 }
 
 SkImageFilter* CanvasRenderingContext2D::stateGetFilter()
 {
     return state().getFilter(canvas(), canvas()->size(), this);
 }
 
 void CanvasRenderingContext2D::snapshotStateForFilter()
 {
+    // The style resolution required for fonts is not available in frame-less documents.
+    if (!canvas()->document().frame())
+        return;
+
     modifiableState().setFontForFilter(accessFont());
 }
 
 SkCanvas* CanvasRenderingContext2D::drawingCanvas() const
 {
     if (isContextLost())
         return nullptr;
     return canvas()->drawingCanvas();
 }
 
@@ skipping 656 matching lines @@
 
 unsigned CanvasRenderingContext2D::hitRegionsCount() const
 {
     if (m_hitRegionManager)
         return m_hitRegionManager->getHitRegionsCount();
 
     return 0;
 }
 
 } // namespace blink