Updating IDL files from Chrome roll.

sdk/lib/web_gl/dartium/web_gl_dartium.dart

Index: sdk/lib/web_gl/dartium/web_gl_dartium.dart
diff --git a/sdk/lib/web_gl/dartium/web_gl_dartium.dart b/sdk/lib/web_gl/dartium/web_gl_dartium.dart
index 867aa672c3de3a81fa1b647d8b71270d3620cde8..dc75871dc43509142b2902c19a6eb2542b4f74d5 100644
--- a/sdk/lib/web_gl/dartium/web_gl_dartium.dart
+++ b/sdk/lib/web_gl/dartium/web_gl_dartium.dart
@@ -544,6 +544,16 @@ class ContextAttributes extends NativeFieldWrapperClass2 {
   @DocsEditable()
   void set depth(bool value) native "WebGLContextAttributes_depth_Setter";
 
+  @DomName('WebGLContextAttributes.failIfMajorPerformanceCaveat')
+  @DocsEditable()
+  @Experimental() // untriaged
+  bool get failIfMajorPerformanceCaveat native "WebGLContextAttributes_failIfMajorPerformanceCaveat_Getter";
+
+  @DomName('WebGLContextAttributes.failIfMajorPerformanceCaveat')
+  @DocsEditable()
+  @Experimental() // untriaged
+  void set failIfMajorPerformanceCaveat(bool value) native "WebGLContextAttributes_failIfMajorPerformanceCaveat_Setter";
+
   @DomName('WebGLContextAttributes.premultipliedAlpha')
   @DocsEditable()
   bool get premultipliedAlpha native "WebGLContextAttributes_premultipliedAlpha_Getter";