Fix etc1 support for SkFiddle.

experimental/webtry/DESIGN.md

 Design
 ======
 
 
 Overview
 --------
 Allows trying out Skia code in the browser.
 
 
 Security
@@ skipping 149 matching lines @@
       name             CHAR(64)  DEFAULT ''                 NOT NULL,
       create_ts        TIMESTAMP DEFAULT CURRENT_TIMESTAMP  NOT NULL,
       hash             CHAR(64)  DEFAULT ''                 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,
+      id        INTEGER     PRIMARY KEY                NOT NULL AUTO_INCREMENT,
       image     MEDIUMBLOB  DEFAULT ''                 NOT NULL, -- Stored as PNG.
       width     INTEGER     DEFAULT 0                  NOT NULL,
       height    INTEGER     DEFAULT 0                  NOT NULL,
       create_ts TIMESTAMP   DEFAULT CURRENT_TIMESTAMP  NOT NULL,
       hidden    INTEGER     DEFAULT 0                  NOT NULL
     );
 
     ALTER TABLE webtry       ADD COLUMN source_image_id INTEGER DEFAULT 0 NOT NULL AFTER hash;
     ALTER TABLE workspacetry ADD COLUMN source_image_id INTEGER DEFAULT 0 NOT NULL AFTER hash;
 
@@ skipping 92 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.