Updating IDL files from Chrome roll.

sdk/lib/web_gl/dartium/web_gl_dartium.dart

 library dart.dom.web_gl;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_internal' hide deprecated;
 import 'dart:html';
 import 'dart:html_common';
 import 'dart:nativewrappers';
 import 'dart:typed_data';
 // DO NOT EDIT
@@ skipping 526 matching lines @@
   void set antialias(bool value) native "WebGLContextAttributes_antialias_Setter";
 
   @DomName('WebGLContextAttributes.depth')
   @DocsEditable()
   bool get depth native "WebGLContextAttributes_depth_Getter";
 
   @DomName('WebGLContextAttributes.depth')
   @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";
 
   @DomName('WebGLContextAttributes.premultipliedAlpha')
   @DocsEditable()
   void set premultipliedAlpha(bool value) native "WebGLContextAttributes_premultipliedAlpha_Setter";
 
   @DomName('WebGLContextAttributes.preserveDrawingBuffer')
   @DocsEditable()
@@ skipping 2525 matching lines @@
 
 @DocsEditable()
 @DomName('WebGLVertexArrayObjectOES')
 // http://www.khronos.org/registry/webgl/extensions/OES_vertex_array_object/
 @Experimental() // experimental
 class VertexArrayObject extends NativeFieldWrapperClass2 {
   // To suppress missing implicit constructor warnings.
   factory VertexArrayObject._() { throw new UnsupportedError("Not supported"); }
 
 }