Adding support for controlling the global sRGB SkColor switch.

tools/skiaserve/urlhandlers/UrlHandler.h

 /*
  * 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 "SkColor.h"
 
 struct MHD_Connection;
@@ skipping 123 matching lines @@
  * Posting to /colorMode/0 turns on L32, /colorMode/1 turns on sRGB,
  * /colorMode/2 turns on FP16.
  */
 class ColorModeHandler : public UrlHandler {
 public:
     bool canHandle(const char* method, const char* url) override;
     int handle(Request* request, MHD_Connection* connection,
                const char* url, const char* method,
                const char* upload_data, size_t* upload_data_size) override;
 };
+
+/**
+ * Controls the global sRGB flag (is SkColor treated as sRGB or not).
+ * Posting to /srgbMode/0 causes SkColor to be linear, /colorMode/1
+ * causes SkColor to be sRGB;
+ */
+class SRGBModeHandler : public UrlHandler {
+public:
+    bool canHandle(const char* method, const char* url) override;
+    int handle(Request* request, MHD_Connection* connection,
+               const char* url, const char* method,
+               const char* upload_data, size_t* upload_data_size) override;
+};