Add default fonts for extensions

extensions/renderer/dispatcher.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/renderer/dispatcher.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/debug/alias.h"
@@ skipping 307 matching lines @@
 
   context->DispatchOnUnloadEvent();
   // TODO(kalman): add an invalidation observer interface to ScriptContext.
   request_sender_->InvalidateSource(context);
 
   script_context_set_.Remove(context);
   VLOG(1) << "Num tracked contexts: " << script_context_set_.size();
 }
 
 void Dispatcher::DidCreateDocumentElement(blink::WebFrame* frame) {
-  if (IsWithinPlatformApp()) {
-    // WebKit doesn't let us define an additional user agent stylesheet, so we
-    // insert the default platform app stylesheet into all documents that are
-    // loaded in each app.
+  // Note: use GetEffectiveDocumentURL not just frame->document()->url()
+  // so that this also injects the stylesheet on about:blank frames that
+  // are hosted in the extension process.
+  GURL effective_document_url = ScriptContext::GetEffectiveDocumentURL(
+      frame, frame->document().url(), true /* match_about_blank */);
+  const Extension* extension =
+      extensions_.GetExtensionOrAppByURL(effective_document_url);
+
+  if (extension &&
+      (extension->is_extension() || extension->is_platform_app())) {
+    int resource_id =
+        extension->is_platform_app() ? IDR_PLATFORM_APP_CSS : IDR_EXTENSION_CSS;
     std::string stylesheet = ResourceBundle::GetSharedInstance()
-                                 .GetRawDataResource(IDR_PLATFORM_APP_CSS)
+                                 .GetRawDataResource(resource_id)
                                  .as_string();
     ReplaceFirstSubstringAfterOffset(
         &stylesheet, 0, "$FONTFAMILY", system_font_family_);
     ReplaceFirstSubstringAfterOffset(
         &stylesheet, 0, "$FONTSIZE", system_font_size_);
+
+    // Blink doesn't let us define an additional user agent stylesheet, so
+    // we insert the default platform app or extension stylesheet into all
+    // documents that are loaded in each app or extension.
     frame->document().insertStyleSheet(WebString::fromUTF8(stylesheet));
   }
-
   content_watcher_->DidCreateDocumentElement(frame);
 }
 
 void Dispatcher::DidMatchCSS(
     blink::WebFrame* frame,
     const blink::WebVector<blink::WebString>& newly_matching_selectors,
     const blink::WebVector<blink::WebString>& stopped_matching_selectors) {
   content_watcher_->DidMatchCSS(
       frame, newly_matching_selectors, stopped_matching_selectors);
 }
@@ skipping 845 matching lines @@
     return v8::Handle<v8::Object>();
 
   if (bind_name)
     *bind_name = split.back();
 
   return bind_object.IsEmpty() ? AsObjectOrEmpty(GetOrCreateChrome(context))
                                : bind_object;
 }
 
 }  // namespace extensions