Provide shared context to Platform API in renderer.

content/browser/in_process_webkit/browser_webkitplatformsupport_impl.cc

Index: content/browser/in_process_webkit/browser_webkitplatformsupport_impl.cc
diff --git a/content/browser/in_process_webkit/browser_webkitplatformsupport_impl.cc b/content/browser/in_process_webkit/browser_webkitplatformsupport_impl.cc
index 5a697b22bdc5ffde5aa01c00dfc805d938d29b2b..3ddced2e70ca9ce166a73159ba34094249ca5f44 100644
--- a/content/browser/in_process_webkit/browser_webkitplatformsupport_impl.cc
+++ b/content/browser/in_process_webkit/browser_webkitplatformsupport_impl.cc
@@ -121,9 +121,17 @@ int BrowserWebKitPlatformSupportImpl::databaseDeleteFile(
   return file_util::Delete(path, false) ? 0 : 1;
 }
 
-GpuChannelHostFactory*
-BrowserWebKitPlatformSupportImpl::GetGpuChannelHostFactory() {
-  return BrowserGpuChannelHostFactory::instance();
+WebKit::WebGraphicsContext3D* BrowserWebKitPlatformSupportImpl::
+    createOffscreenGraphicsContext3D(
+        const WebKit::WebGraphicsContext3D::Attributes& attributes) {
+  NOTREACHED();
+  return NULL;
+}
+
+WebKit::WebGraphicsContext3D* BrowserWebKitPlatformSupportImpl::
+     sharedOffscreenGraphicsContext3D() {
+  NOTREACHED();
+  return NULL;
 }
 
 }  // namespace content