Guard against most unintentionally ephemeral SkAutoFoo instantiations.

src/ports/SkFontHost_win.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkAdvancedTypefaceMetrics.h"
 #include "SkBase64.h"
@@ skipping 2135 matching lines @@
         SelectObject(fHdc, fSavefont);
         DeleteObject(fFont);
         DeleteDC(fHdc);
     }
     operator HDC() { return fHdc; }
 private:
     HDC fHdc;
     HFONT fFont;
     HFONT fSavefont;
 };
+#define SkAutoHDC(...) SK_REQUIRE_LOCAL_VAR(SkAutoHDC)
 
 int LogFontTypeface::onCharsToGlyphs(const void* chars, Encoding encoding,
                                      uint16_t userGlyphs[], int glyphCount) const
 {
     SkAutoHDC hdc(fLogFont);
 
     TEXTMETRIC tm;
     if (0 == GetTextMetrics(hdc, &tm)) {
         call_ensure_accessible(fLogFont);
         if (0 == GetTextMetrics(hdc, &tm)) {
@@ skipping 442 matching lines @@
 
 private:
     SkTDArray<ENUMLOGFONTEX> fLogFontArray;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SkFontMgr* SkFontMgr_New_GDI() {
     return SkNEW(SkFontMgrGDI);
 }