Workaround for webkit change that broke Gears. The fix is to use a V8

extension to inject a getter into every page which loads the gears plugin when
accessed.

BUG=http://code.google.com/p/chromium/issues/detail?id=8209
Review URL: http://codereview.chromium.org/27294

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@10663 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 71 insertions, 0 deletions

diff --git a/webkit/port/bindings/v8/extensions/Gears.cpp b/webkit/port/bindings/v8/extensions/Gears.cpp
new file mode 100755
index 0000000..54787a8
--- /dev/null
+++ b/webkit/port/bindings/v8/extensions/Gears.cpp
@@ -0,0 +1,45 @@
+// Copyright (c) 2006-2009 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 "config.h"
+#include "Gears.h"
+
+namespace WebCore {
+
+const char* kGearsExtensionName = "v8/Gears";
+
+// Note: when a page touches the "google.gears.factory" object, this script
+// touches the DOM.  We expect the DOM to be available at that time.
+const char* kGearsExtensionScript =
+    "var google;"
+    "if (!google)"
+    "  google = {};"
+    "if (!google.gears)"
+    "  google.gears = {};"
+    "(function() {"
+    "  var factory = null;"
+    "  google.gears.__defineGetter__('factory', function() {"
+    "    if (!factory) {"
+    "      factory = document.createElement('object');"
+    "      factory.width = 0;"
+    "      factory.height = 0;"
+    "      factory.style.visibility = 'hidden';"
+    "      factory.type = 'application/x-googlegears';"
+    "      document.documentElement.appendChild(factory);"
+    "    }"
+    "    return factory;"
+    "  });"
+    "})();";
+
+class GearsExtensionWrapper : public v8::Extension {
+public:
+    GearsExtensionWrapper() : 
+        v8::Extension(kGearsExtensionName, kGearsExtensionScript) {}
+};
+
+v8::Extension* GearsExtension::Get() {
+    return new GearsExtensionWrapper();
+}
+
+}
diff --git a/webkit/port/bindings/v8/extensions/Gears.h b/webkit/port/bindings/v8/extensions/Gears.h
new file mode 100755
index 0000000..4e6c07d
--- /dev/null
+++ b/webkit/port/bindings/v8/extensions/Gears.h
@@ -0,0 +1,24 @@
+// Copyright (c) 2006-2009 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.
+
+// The GearsExtension is a v8 extension to add a "google.gears.factory" getter
+// on the page, which, when accessed, lazily inserts the gears plugin into
+// the page and attaches it to the factory variable.
+
+#ifndef GEARS_EXTENSION_H__
+#define GEARS_EXTENSION_H__
+
+#include "v8.h"
+
+namespace WebCore {
+
+class GearsExtension {
+ public:
+  static v8::Extension* Get();
+};
+
+}
+
+#endif  // GEARS_EXTENSION_H__
+
diff --git a/webkit/port/bindings/v8/v8_proxy.cpp b/webkit/port/bindings/v8/v8_proxy.cpp
index 56f62e6..20c6ccf 100644
--- a/webkit/port/bindings/v8/v8_proxy.cpp
+++ b/webkit/port/bindings/v8/v8_proxy.cpp
@@ -206,6 +206,7 @@
 #endif
 
 #include "extensions/GCController.h"
+#include "extensions/Gears.h"
 #include "extensions/Interval.h"
 #include "extensions/Playback.h"
 
@@ -2323,6 +2324,7 @@ void V8Proxy::InitContextIfNeeded()
     v8::V8::SetFailedAccessCheckCallbackFunction(ReportUnsafeJavaScriptAccess);
 
     // Register known extensions
+    RegisterExtension(GearsExtension::Get());
     RegisterExtension(IntervalExtension::Get());
     if (ScriptController::shouldExposeGCController())
       RegisterExtension(GCExtension::Get());