Modify blink type map to finalize lazily

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 caddc818774d617643b721a732362730373a6583..f1ed131b4720df3c2036633dfdddc7d97200a13c 100644
--- a/sdk/lib/web_gl/dartium/web_gl_dartium.dart
+++ b/sdk/lib/web_gl/dartium/web_gl_dartium.dart
@@ -16,38 +16,38 @@ import 'dart:_blink' as _blink;
 
 
 // FIXME: Can we make this private?
-const web_glBlinkMap = const {
-  'ANGLEInstancedArrays': AngleInstancedArrays,
-  'EXTFragDepth': ExtFragDepth,
-  'EXTTextureFilterAnisotropic': ExtTextureFilterAnisotropic,
-  'OESElementIndexUint': OesElementIndexUint,
-  'OESStandardDerivatives': OesStandardDerivatives,
-  'OESTextureFloat': OesTextureFloat,
-  'OESTextureFloatLinear': OesTextureFloatLinear,
-  'OESTextureHalfFloat': OesTextureHalfFloat,
-  'OESTextureHalfFloatLinear': OesTextureHalfFloatLinear,
-  'OESVertexArrayObject': OesVertexArrayObject,
-  'WebGLActiveInfo': ActiveInfo,
-  'WebGLBuffer': Buffer,
-  'WebGLCompressedTextureATC': CompressedTextureAtc,
-  'WebGLCompressedTexturePVRTC': CompressedTexturePvrtc,
-  'WebGLCompressedTextureS3TC': CompressedTextureS3TC,
-  'WebGLContextAttributes': ContextAttributes,
-  'WebGLContextEvent': ContextEvent,
-  'WebGLDebugRendererInfo': DebugRendererInfo,
-  'WebGLDebugShaders': DebugShaders,
-  'WebGLDepthTexture': DepthTexture,
-  'WebGLDrawBuffers': DrawBuffers,
-  'WebGLFramebuffer': Framebuffer,
-  'WebGLLoseContext': LoseContext,
-  'WebGLProgram': Program,
-  'WebGLRenderbuffer': Renderbuffer,
-  'WebGLRenderingContext': RenderingContext,
-  'WebGLShader': Shader,
-  'WebGLShaderPrecisionFormat': ShaderPrecisionFormat,
-  'WebGLTexture': Texture,
-  'WebGLUniformLocation': UniformLocation,
-  'WebGLVertexArrayObjectOES': VertexArrayObject,
+final web_glBlinkMap = {
+  'ANGLEInstancedArrays': () => AngleInstancedArrays,
+  'EXTFragDepth': () => ExtFragDepth,
+  'EXTTextureFilterAnisotropic': () => ExtTextureFilterAnisotropic,
+  'OESElementIndexUint': () => OesElementIndexUint,
+  'OESStandardDerivatives': () => OesStandardDerivatives,
+  'OESTextureFloat': () => OesTextureFloat,
+  'OESTextureFloatLinear': () => OesTextureFloatLinear,
+  'OESTextureHalfFloat': () => OesTextureHalfFloat,
+  'OESTextureHalfFloatLinear': () => OesTextureHalfFloatLinear,
+  'OESVertexArrayObject': () => OesVertexArrayObject,
+  'WebGLActiveInfo': () => ActiveInfo,
+  'WebGLBuffer': () => Buffer,
+  'WebGLCompressedTextureATC': () => CompressedTextureAtc,
+  'WebGLCompressedTexturePVRTC': () => CompressedTexturePvrtc,
+  'WebGLCompressedTextureS3TC': () => CompressedTextureS3TC,
+  'WebGLContextAttributes': () => ContextAttributes,
+  'WebGLContextEvent': () => ContextEvent,
+  'WebGLDebugRendererInfo': () => DebugRendererInfo,
+  'WebGLDebugShaders': () => DebugShaders,
+  'WebGLDepthTexture': () => DepthTexture,
+  'WebGLDrawBuffers': () => DrawBuffers,
+  'WebGLFramebuffer': () => Framebuffer,
+  'WebGLLoseContext': () => LoseContext,
+  'WebGLProgram': () => Program,
+  'WebGLRenderbuffer': () => Renderbuffer,
+  'WebGLRenderingContext': () => RenderingContext,
+  'WebGLShader': () => Shader,
+  'WebGLShaderPrecisionFormat': () => ShaderPrecisionFormat,
+  'WebGLTexture': () => Texture,
+  'WebGLUniformLocation': () => UniformLocation,
+  'WebGLVertexArrayObjectOES': () => VertexArrayObject,
 
 };
 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file