Adding support for playback to L32/S32/F16 canvas.

tools/skiaserve/urlhandlers/UrlHandler.h

Index: tools/skiaserve/urlhandlers/UrlHandler.h
diff --git a/tools/skiaserve/urlhandlers/UrlHandler.h b/tools/skiaserve/urlhandlers/UrlHandler.h
index 02a07b0d143d157e591020591cced7e2ae96aa30..adbdcb9aa2e3540eb3ecc06b9c4f2fef5a9eadc5 100644
--- a/tools/skiaserve/urlhandlers/UrlHandler.h
+++ b/tools/skiaserve/urlhandlers/UrlHandler.h
@@ -128,3 +128,16 @@ public:
                const char* url, const char* method,
                const char* upload_data, size_t* upload_data_size) override;
 };
+
+/**
+ * Controls how rendering is performed (L32, S32, F16).
+ * 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;
+};