pdf viewer: fix a few warnings, and enable warning as errors

experimental/PdfViewer/SkPdfFont.h

 #ifndef __DEFINED__SkPdfFont
 #define __DEFINED__SkPdfFont
 
 #include "SkPdfHeaders_autogen.h"
 #include "SkPdfMapper_autogen.h"
 
 #include <map>
 #include <string>
 
 #include "SkTypeface.h"
 #include "SkUtils.h"
 #include "SkPdfBasics.h"
 #include "SkPdfUtils.h"
 
 
 class SkPdfType0Font;
 class SkPdfType1Font;
 class SkPdfType3Font;
 class SkPdfTrueTypeFont;
 class SkPdfMultiMasterFont;
 class SkPdfFont;
 
-
 struct SkPdfStandardFontEntry {
+    // We don't own this pointer!
     const char* fName;
     bool fIsBold;
     bool fIsItalic;
+    SkPdfStandardFontEntry()
+    : fName(NULL),
+      fIsBold(false),
+      fIsItalic(false) {}
+
+    SkPdfStandardFontEntry(const char* name, bool bold, bool italic)
+        : fName(name),
+          fIsBold(bold),
+          fIsItalic(italic) {}
 };
 
 std::map<std::string, SkPdfStandardFontEntry>& getStandardFonts();
 SkTypeface* SkTypefaceFromPdfStandardFont(const char* fontName, bool bold, bool italic);
 SkPdfFont* fontFromName(SkNativeParsedPDF* doc, SkPdfObject* obj, const char* fontName);
 
 struct SkUnencodedText {
     void* text;
     int len;
 
@@ skipping 363 matching lines @@
                              SkDoubleToScalar(0.0));
         return fChars[ch - fFirstChar].fWidth;
     }
 
     virtual void afterWord(SkPaint* paint, SkMatrix* matrix) {
 
     }
 };
 
 #endif  // __DEFINED__SkPdfFont