Initial error handling code

include/core/SkFlattenableBuffers.h

Index: include/core/SkFlattenableBuffers.h
diff --git a/include/core/SkFlattenableBuffers.h b/include/core/SkFlattenableBuffers.h
index 03c03f3877e6f8e3f508d29e371d5c7ebd91624e..0b7ae7525abf5594c1de7db1b670f7226349ebef 100644
--- a/include/core/SkFlattenableBuffers.h
+++ b/include/core/SkFlattenableBuffers.h
@@ -41,14 +41,16 @@ public:
         kCrossProcess_Flag      = 1 << 0,
         kScalarIsFloat_Flag     = 1 << 1,
         kPtrIs64Bit_Flag        = 1 << 2,
+        kSecure_Flag            = 1 << 3,
     };
 
     void setFlags(uint32_t flags) { fFlags = flags; }
     uint32_t getFlags() const { return fFlags; }
 
-    bool isCrossProcess() const { return SkToBool(fFlags & kCrossProcess_Flag); }
+    bool isCrossProcess() const { return SkToBool(fFlags & (kCrossProcess_Flag | kSecure_Flag)); }
     bool isScalarFloat() const { return SkToBool(fFlags & kScalarIsFloat_Flag); }
     bool isPtr64Bit() const { return SkToBool(fFlags & kPtrIs64Bit_Flag); }
+    bool isSecure() const { return SkToBool(fFlags & kSecure_Flag); }
 
     // primitives
     virtual bool readBool() = 0;
@@ -102,6 +104,13 @@ public:
         return static_cast<T*>(this->readFlattenable());
     }
 
+    void setError() {
+        fError = true;
+    }
+
+protected:
+    bool fError;
+
 private:
     uint32_t fFlags;
 };
@@ -154,13 +163,18 @@ public:
 
     enum Flags {
         kCrossProcess_Flag               = 0x01,
+        kSecure_Flag                     = 0x02,
     };
 
     uint32_t getFlags() const { return fFlags; }
     void setFlags(uint32_t flags) { fFlags = flags; }
 
     bool isCrossProcess() const {
-        return SkToBool(fFlags & kCrossProcess_Flag);
+        return SkToBool(fFlags & (kCrossProcess_Flag | kSecure_Flag));
+    }
+
+    bool isSecure() const {
+        return SkToBool(fFlags & kSecure_Flag);
     }
 
     bool persistTypeface() const { return (fFlags & kCrossProcess_Flag) != 0; }