Implement chrome.browserAction.setIcon({path:...});

chrome/renderer/resources/extension_process_bindings.js

Index: chrome/renderer/resources/extension_process_bindings.js
diff --git a/chrome/renderer/resources/extension_process_bindings.js b/chrome/renderer/resources/extension_process_bindings.js
index 29416441f174ddfccf52abb5d8cd9a6695f230aa..110147e8ae2cdd17ad15a2868b201e007fd10127 100644
--- a/chrome/renderer/resources/extension_process_bindings.js
+++ b/chrome/renderer/resources/extension_process_bindings.js
@@ -333,6 +333,7 @@ var chrome = chrome || {};
       return GetL10nMessage(message_name, placeholders);
     }
 
+    var canvas_context;
     apiFunctions["browserAction.setIcon"].handleRequest = function(details) {
       if ("iconIndex" in details) {
         sendRequest(this.name, arguments, this.definition.parameters);
@@ -352,6 +353,30 @@ var chrome = chrome || {};
 
         sendCustomRequest(SetBrowserActionIcon, "browserAction.setIcon",
                           details, this.definition.parameters);
+      } else if ("path" in details) {
+        if (!canvas_context) {
+          var canvas = document.createElement("canvas");
+          canvas.width = 19;

[Matt Perry, 2009/10/16 19:06:05]

isn't it 21 now?

+          canvas.height = 19;
+          canvas_context = canvas.getContext('2d');
+        }
+        
+        var img = new Image();
+        var self = this;
+        img.onerror = function() {
+          console.error("Could not load browser action icon '" + details.path +
+                        "'.");
+        }
+        img.onload = function() {
+          canvas_context.clearRect(0, 0, context.width, context.height);
+          canvas_context.drawImage(img, 0, 0, context.width, context.height);
+          delete details.path;
+          details.imageData = canvas_context.getImageData(0, 0, context.width,
+                                                          context.height);
+          sendCustomRequest(SetBrowserActionIcon, "browserAction.setIcon",
+                            details, self.definition.parameters);
+        }
+        img.src = details.path;
       } else {
         throw new Error(
             "Either the iconIndex or imageData property must be specified.");