Fix texImage2D on Dartium.

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 411dd69337e8ea46249eb2f3cdab4a2c631ce7e2..83879618b1ad18ca244b231d9cbd3dd5d561609b 100644
--- a/sdk/lib/web_gl/dartium/web_gl_dartium.dart
+++ b/sdk/lib/web_gl/dartium/web_gl_dartium.dart
@@ -2793,8 +2793,19 @@ class RenderingContext extends CanvasRenderingContext {
   @DomName('WebGLRenderingContext.texImage2D')
   void texImage2D(int targetTexture, int levelOfDetail, int internalFormat,
       int format, int type, data) {
-    _texImage2D(targetTexture, levelOfDetail, internalFormat,
-        format, type, data);
+    if (data is ImageElement) {
+      texImage2DImage(targetTexture, levelOfDetail, internalFormat, format,
+          type, data);
+    } else if (data is ImageData) {
+      texImage2DImageData(targetTexture, levelOfDetail, internalFormat, format,
+          type, data);
+    } else if (data is CanvasElement) {
+      texImage2DCanvas(targetTexture, levelOfDetail, internalFormat, format,
+          type, data);
+    } else {
+      texImage2DVideo(targetTexture, levelOfDetail, internalFormat, format,
+          type, data);
+    }
   }
 
   /**