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 93b03ecba034e6cc6d9a52220de3014b31185e7e..aacfcacd52b1443f1d788b1af1dcd8f4c0b53755 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/stats_collection_controller.h"
@@ -20,6 +21,8 @@
 namespace html_viewer {
 namespace {
 
+const char kDisableWebGLSwitch[] = "disable-webgl";
+
 scoped_ptr<WebLayerTreeViewImpl> CreateWebLayerTreeView(
     GlobalState* global_state) {
   return make_scoped_ptr(new WebLayerTreeViewImpl(
@@ -57,6 +60,10 @@ 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