add support for skfiddle width/height options

experimental/webtry/DESIGN.md

 Design
 ======
 
 
 Overview
 --------
 Allows trying out Skia code in the browser.
 
 
 Security
@@ skipping 126 matching lines @@
     GRANT SELECT, INSERT, UPDATE ON webtry.workspace     TO 'webtry'@'%';
     GRANT SELECT, INSERT, UPDATE ON webtry.workspacetry  TO 'webtry'@'%';
     GRANT SELECT, INSERT, UPDATE ON webtry.source_images TO 'webtry'@'%';
 
     // If this gets changed also update the sqlite create statement in webtry.go.
 
     CREATE TABLE webtry (
       code               TEXT      DEFAULT ''                 NOT NULL,
       create_ts          TIMESTAMP DEFAULT CURRENT_TIMESTAMP  NOT NULL,
       hash               CHAR(64)  DEFAULT ''                 NOT NULL,
+      width              INTEGER   DEFAULT 256                NOT NULL,
+      height             INTEGER   DEFAULT 256                NOT NULL,
       source_image_id    INTEGER   DEFAULT 0                  NOT NULL,
       PRIMARY KEY(hash),
 
       FOREIGN KEY (source) REFERENCES sources(id)
     );
 
     CREATE TABLE workspace (
       name      CHAR(64)  DEFAULT ''                 NOT NULL,
       create_ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP  NOT NULL,
       PRIMARY KEY(name),
     );
 
     CREATE TABLE workspacetry (
       name             CHAR(64)  DEFAULT ''                 NOT NULL,
       create_ts        TIMESTAMP DEFAULT CURRENT_TIMESTAMP  NOT NULL,
       hash             CHAR(64)  DEFAULT ''                 NOT NULL,
+      width            INTEGER   DEFAULT 256                NOT NULL,
+      height           INTEGER   DEFAULT 256                NOT NULL,
       source_image_id  INTEGER   DEFAULT 0                  NOT NULL,
       hidden           INTEGER   DEFAULT 0                  NOT NULL,
 
       FOREIGN KEY (name)   REFERENCES workspace(name),
     );
 
     CREATE TABLE source_images (
       id        INTEGER     PRIMARY KEY                NOT NULL AUTO_INCREMENT,
       image     MEDIUMBLOB  DEFAULT ''                 NOT NULL, -- Stored as PNG.
       width     INTEGER     DEFAULT 0                  NOT NULL,
@@ skipping 100 matching lines @@
   * clike.js       - C-like syntax highlighting support
 
 Alternatively, we may consider pulling CM as an external dependency at some
 point.
 
 Installation
 ------------
 See the README file.