Set temporary paths volatile so we don't cache them.

include/core/SkPath.h

Index: include/core/SkPath.h
diff --git a/include/core/SkPath.h b/include/core/SkPath.h
index 57da95973cda896d00d39a064c4e72f9a1143a6a..d22f21c2f54582b621120fc3fb15f774321c1ad6 100644
--- a/include/core/SkPath.h
+++ b/include/core/SkPath.h
@@ -185,6 +185,23 @@ public:
         return fPathRef->isFinite();
     }
 
+    /** Returns true if the path is volatile (i.e. should not be cached by devices.)
+     */
+    bool isVolatile() const {
+        return fIsVolatile;
+    }
+
+    /** Specify whether this path is volatile. Paths are not volatile by
+     default. Temporary paths that are discarded after use should be

[bsalomon, 2014/10/23 17:54:08]

discarded or modified?

[jvanverth1, 2014/10/23 20:06:18]

Done.

+     marked as volatile. This provides a hint to the device that the path
+     should not be cached. Providing this hint when appropriate can
+     improve performance by avoiding unnecessary overhead and resource
+     consumption on the device.
+     */
+    void setIsVolatile(bool isVolatile) {
+        fIsVolatile = isVolatile;
+    }
+
     /** Test a line for zero length
 
         @return true if the line is of zero length; otherwise false.
@@ -984,6 +1001,7 @@ private:
     uint8_t             fFillType;
     mutable uint8_t     fConvexity;
     mutable uint8_t     fDirection;
+    mutable SkBool8     fIsVolatile;
 #ifdef SK_BUILD_FOR_ANDROID
     const SkPath*       fSourcePath;
 #endif