Fix crash when trying to fill a GlyphPage using a null SkTypeface
Fix crash when trying to fill a GlyphPage using a null SkTypeface

Adding log message to have a chance of capturing a
reproduction for this rare case.

R=eae,jbroman
BUG=439980

Review URL: https://codereview.chromium.org/788203002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@186860 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs