Mandoline: Add WebGL support

components/html_viewer/html_widget.cc

Index: components/html_viewer/html_widget.cc
diff --git a/components/html_viewer/html_widget.cc b/components/html_viewer/html_widget.cc
index ce5f4235e1cdd6b618539ec1820106f69668540f..692bcdfd48ab38827d5153ff58e8ddd6f04aef84 100644
--- a/components/html_viewer/html_widget.cc
+++ b/components/html_viewer/html_widget.cc
@@ -4,6 +4,7 @@
 
 #include "components/html_viewer/html_widget.h"
 
+#include "base/command_line.h"
 #include "components/html_viewer/global_state.h"
 #include "components/html_viewer/ime_controller.h"
 #include "components/html_viewer/web_layer_tree_view_impl.h"
@@ -18,6 +19,8 @@
 namespace html_viewer {
 namespace {
 
+const char kDisableWebGLSwitch[] = "disable-webgl";
+
 scoped_ptr<WebLayerTreeViewImpl> CreateWebLayerTreeView(
     GlobalState* global_state) {
   return make_scoped_ptr(new WebLayerTreeViewImpl(
@@ -55,6 +58,10 @@ void ConfigureSettings(blink::WebSettings* settings) {
   settings->setDefaultFontSize(16);
   settings->setLoadsImagesAutomatically(true);
   settings->setJavaScriptEnabled(true);
+
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  settings->setExperimentalWebGLEnabled(
+      !command_line->HasSwitch(kDisableWebGLSwitch));
 }
 
 }  // namespace