added some missing static modifiers

tools/json/SkJSONCanvas.cpp

Index: tools/json/SkJSONCanvas.cpp
diff --git a/tools/json/SkJSONCanvas.cpp b/tools/json/SkJSONCanvas.cpp
index de7c40cca0277ed2b92b7c6dbefb0335521ee0ed..07c0aeb5d2616bc60e9c9c6ccf24367f92286e64 100644
--- a/tools/json/SkJSONCanvas.cpp
+++ b/tools/json/SkJSONCanvas.cpp
@@ -143,13 +143,14 @@ Json::Value SkJSONCanvas::makeRegion(const SkRegion& region) {
     return Json::Value("<unimplemented>");
 }
 
-void store_scalar(Json::Value* target, const char* key, SkScalar value, SkScalar defaultValue) {
+static void store_scalar(Json::Value* target, const char* key, SkScalar value, 
+                         SkScalar defaultValue) {
     if (value != defaultValue) {
         (*target)[key] = Json::Value(value);
     }
 }
 
-void store_bool(Json::Value* target, const char* key, bool value, bool defaultValue) {
+static void store_bool(Json::Value* target, const char* key, bool value, bool defaultValue) {
     if (value != defaultValue) {
         (*target)[key] = Json::Value(value);
     }