Add the ability to select a source image to use in the code.

experimental/webtry/templates/content.html

Index: experimental/webtry/templates/content.html
diff --git a/experimental/webtry/templates/content.html b/experimental/webtry/templates/content.html
index 8638cf2bd1cf04f6684919ba510a83515d31bfcd..0f2177a38a83253cb23b9ca4ad5ba017183db9da 100644
--- a/experimental/webtry/templates/content.html
+++ b/experimental/webtry/templates/content.html
@@ -1,5 +1,23 @@
 
 <section id=content>
+
+  <template id=sourcesTemplate>
+      <button id="" class=source><img width=64 height=64 src=''></button>
+  </template>
+  <input type="checkbox" id="enableSource" data-id="{{.Source}}"> Use an input bitmap.
+  <br>
+  <button id=selectedSource></button>
+  <pre id=sourceCode>SkBitmap source;</pre>
+  <div id=chooseSource>
+    Choose an image below or upload a new one to use as an input bitmap.
+    <div id="chooseList">
+    </div>
+    <form action="/sources/" method="post" accept-charset="utf-8" enctype="multipart/form-data">
+      <input type="file" accept="image/*" name="upload" value="" id="upload">
+      <input type="submit" value="Add Image">
+    </form>
+  </div>
+
   <pre>
     <textarea spellcheck=false name='code' id='code' rows='15' cols='100'>{{.Code}}</textarea>
   </pre>
@@ -9,6 +27,7 @@
 
   <input type='button' value='Embed' id='embedButton' disabled/>
   <input type="text" value="" id="embed" readonly style="display:none;">
+  <br>
 
   <p>
   <img  touch-action='none' class='zoom' id='img' src='{{if .Hash}}/i/{{.Hash}}.png{{end}}'/>