Deal gracefully with null {GraphicsContext,SkPictureBuilder}.endRecording() results.

third_party/WebKit/Source/platform/exported/WebFont.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "public/platform/WebFont.h"
 
 #include "platform/fonts/Font.h"
 #include "platform/fonts/FontCache.h"
 #include "platform/fonts/FontDescription.h"
 #include "platform/graphics/GraphicsContext.h"
@@ skipping 89 matching lines @@
 
     ASSERT(!DrawingRecorder::useCachedDrawingIfPossible(context, *m_private, DisplayItem::WebFont));
     {
         DrawingRecorder drawingRecorder(context, *m_private, DisplayItem::WebFont, intRect);
         context.save();
         context.setFillColor(color);
         context.clip(textClipRect);
         context.drawText(m_private->getFont(), runInfo, leftBaseline);
         context.restore();
     }
-
-    pictureBuilder.endRecording()->playback(canvas);
+    RefPtr<const SkPicture> recording = pictureBuilder.endRecording();
+    if (recording)
+        recording->playback(canvas);
 }
 
 int WebFont::calculateWidth(const WebTextRun& run) const
 {
     return m_private->getFont().width(run, 0);
 }
 
 int WebFont::offsetForPosition(const WebTextRun& run, float position) const
 {
     return m_private->getFont().offsetForPosition(run, position, true);
 }
 
 WebFloatRect WebFont::selectionRectForText(const WebTextRun& run, const WebFloatPoint& leftBaseline, int height, int from, int to) const
 {
     return m_private->getFont().selectionRectForText(run, leftBaseline, height, from, to);
 }
 
 } // namespace blink