move failable work outside of constructors for SkGlyphCache and SkScalerContextGDI. If we fail, try…

src/ports/SkFontHost_win.cpp

Index: src/ports/SkFontHost_win.cpp
diff --git a/src/ports/SkFontHost_win.cpp b/src/ports/SkFontHost_win.cpp
index 0874e3b9c376e463274dd7dce7d89deded3728cb..eb55748069145b6ab3df9f627a4794399789ba53 100755
--- a/src/ports/SkFontHost_win.cpp
+++ b/src/ports/SkFontHost_win.cpp
@@ -505,7 +505,8 @@ const void* HDCOffscreen::draw(const SkGlyph& glyph, bool isBW,
 
 class SkScalerContext_Windows : public SkScalerContext {
 public:
-    SkScalerContext_Windows(SkTypeface*, const SkDescriptor* desc);
+    // we take ownership of the HDC
+    SkScalerContext_Windows(SkTypeface*, const SkDescriptor* desc, HDC);
     virtual ~SkScalerContext_Windows();
 
 protected:
@@ -572,17 +573,18 @@ static BYTE compute_quality(const SkScalerContext::Rec& rec) {
 }
 
 SkScalerContext_Windows::SkScalerContext_Windows(SkTypeface* rawTypeface,
-                                                 const SkDescriptor* desc)
+                                                 const SkDescriptor* desc,
+                                                 HDC ddc)
         : SkScalerContext(rawTypeface, desc)
-        , fDDC(0)
+        , fDDC(ddc)
         , fFont(0)
         , fSavefont(0)
         , fSC(0)
         , fGlyphCount(-1)
 {
+    SkASSERT(fDDC);
     LogFontTypeface* typeface = reinterpret_cast<LogFontTypeface*>(rawTypeface);
 
-    fDDC = ::CreateCompatibleDC(NULL);
     SetGraphicsMode(fDDC, GM_ADVANCED);
     SetBkMode(fDDC, TRANSPARENT);
 
@@ -687,10 +689,9 @@ SkScalerContext_Windows::SkScalerContext_Windows(SkTypeface* rawTypeface,
 }
 
 SkScalerContext_Windows::~SkScalerContext_Windows() {
-    if (fDDC) {
-        ::SelectObject(fDDC, fSavefont);
-        ::DeleteDC(fDDC);
-    }
+    ::SelectObject(fDDC, fSavefont);
+    ::DeleteDC(fDDC);
+
     if (fFont) {
         ::DeleteObject(fFont);
     }
@@ -1665,7 +1666,11 @@ SkStream* LogFontTypeface::onOpenStream(int* ttcIndex) const {
 }
 
 SkScalerContext* LogFontTypeface::onCreateScalerContext(const SkDescriptor* desc) const {
-    return SkNEW_ARGS(SkScalerContext_Windows, (const_cast<LogFontTypeface*>(this), desc));
+    HDC hdc = ::CreateCompatibleDC(NULL);
+    if (!hdc) {
+        return NULL;
+    }
+    return SkNEW_ARGS(SkScalerContext_Windows, (const_cast<LogFontTypeface*>(this), desc, hdc));
 }
 
 /** Return the closest matching typeface given either an existing family