added some missing static modifiers

tools/json/SkJSONCanvas.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkJSONCanvas.h"
 #include "SkColorFilter.h"
 #include "SkImageFilter.h"
@@ skipping 125 matching lines @@
         }
     }
     result[SKJSONCANVAS_ATTRIBUTE_VERBS] = verbs;
     return result;
 }
 
 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);
     }
 }
 
 static void encode_data(const void* data, size_t count, Json::Value* target) {
     // just use a brain-dead JSON array for now, switch to base64 or something else smarter down the
     // road
     for (size_t i = 0; i < count; i++) {
         target->append(((const uint8_t*)data)[i]);
@@ skipping 745 matching lines @@
         Json::Value backdrop;
         flatten(rec.fBackdrop, &backdrop, fSendBinaries);
         command[SKJSONCANVAS_ATTRIBUTE_BACKDROP] = backdrop;
     }
     if (rec.fSaveLayerFlags != 0) {
         SkDebugf("unsupported: saveLayer flags\n");
     }
     fCommands.append(command);
     return this->INHERITED::getSaveLayerStrategy(rec);
 }