Add support for chrome.extension API in devtools extension.

atom/renderer/atom_renderer_client.cc

@@ -199,6 +199,10 @@ bool AtomRendererClient::IsNodeBindingEnabled(blink::WebFrame* frame) {
   // Node integration is enabled in main frame unless explictly disabled.
   else if (frame == main_frame_)
     return true;
+  // Enable node integration in chrome extensions.
+  else if (frame != NULL &&
+           GURL(frame->document().url()).SchemeIs("chrome-extension"))
+    return true;
   else if (node_integration_ == MANUAL_ENABLE_IFRAME &&
            frame != NULL &&
            frame->uniqueName().utf8().find(kSecurityEnableNodeIntegration)

atom/renderer/lib/chrome-api.coffee

@@ -0,0 +1,10 @@
+url = require 'url'
+
+chrome = window.chrome = window.chrome || {}
+chrome.extension =
+  getURL: (path) ->
+    url.format
+      protocol: location.protocol
+      slashes: true
+      hostname: location.hostname
+      pathname: path

atom/renderer/lib/init.coffee

@@ -46,6 +46,9 @@ else
 if location.protocol is 'chrome-devtools:'
   # Override some inspector APIs.
   require path.join(__dirname, 'inspector')
+else if location.protocol is 'chrome-extension:'
+  # Add implementations of chrome API.
+  require path.join(__dirname, 'chrome-api')
 else
   # Override default web functions.
   require path.join(__dirname, 'override')