Add infobar warning when accelerated 2d canvas is enabled.

chrome/browser/ui/browser_init.cc

Index: chrome/browser/ui/browser_init.cc
===================================================================
--- chrome/browser/ui/browser_init.cc	(revision 84902)
+++ chrome/browser/ui/browser_init.cc	(working copy)
@@ -1047,6 +1047,10 @@
   // Unsupported flags for which to display a warning that "stability and
   // security will suffer".
   static const char* kBadFlags[] = {
+    // Warn when accelerated 2d canvas is enabled as its presence can
+    // affect stability and rendering correctness of certain pages.
+    // TODO(vangelis): Remove when accelerated 2d canvas is enabled by default.
+    switches::kEnableAccelerated2dCanvas,
     // These imply disabling the sandbox.
     switches::kSingleProcess,
     switches::kNoSandbox,