Make dart:dom implementation types private so they don't muddle the docs.

client/dom/generated/src/frog/CanvasRenderingContext2D.dart

 
-class CanvasRenderingContext2DJs extends CanvasRenderingContextJs implements CanvasRenderingContext2D native "*CanvasRenderingContext2D" {
+class _CanvasRenderingContext2DJs extends _CanvasRenderingContextJs implements CanvasRenderingContext2D native "*CanvasRenderingContext2D" {
 
   Dynamic get fillStyle() native "return this.fillStyle;";
 
   void set fillStyle(Dynamic value) native "this.fillStyle = value;";
 
   String get font() native "return this.font;";
 
   void set font(String value) native "this.font = value;";
 
   num get globalAlpha() native "return this.globalAlpha;";
@@ skipping 65 matching lines @@
   void bezierCurveTo(num cp1x, num cp1y, num cp2x, num cp2y, num x, num y) native;
 
   void clearRect(num x, num y, num width, num height) native;
 
   void clearShadow() native;
 
   void clip() native;
 
   void closePath() native;
 
-  ImageDataJs createImageData(var imagedata_OR_sw, [num sh = null]) native;
+  _ImageDataJs createImageData(var imagedata_OR_sw, [num sh = null]) native;
 
-  CanvasGradientJs createLinearGradient(num x0, num y0, num x1, num y1) native;
+  _CanvasGradientJs createLinearGradient(num x0, num y0, num x1, num y1) native;
 
-  CanvasPatternJs createPattern(var canvas_OR_image, String repetitionType) native;
+  _CanvasPatternJs createPattern(var canvas_OR_image, String repetitionType) native;
 
-  CanvasGradientJs createRadialGradient(num x0, num y0, num r0, num x1, num y1, num r1) native;
+  _CanvasGradientJs createRadialGradient(num x0, num y0, num r0, num x1, num y1, num r1) native;
 
   void drawImage(var canvas_OR_image_OR_video, num sx_OR_x, num sy_OR_y, [num sw_OR_width = null, num height_OR_sh = null, num dx = null, num dy = null, num dw = null, num dh = null]) native;
 
-  void drawImageFromRect(HTMLImageElementJs image, [num sx = null, num sy = null, num sw = null, num sh = null, num dx = null, num dy = null, num dw = null, num dh = null, String compositeOperation = null]) native;
+  void drawImageFromRect(_HTMLImageElementJs image, [num sx = null, num sy = null, num sw = null, num sh = null, num dx = null, num dy = null, num dw = null, num dh = null, String compositeOperation = null]) native;
 
   void fill() native;
 
   void fillRect(num x, num y, num width, num height) native;
 
   void fillText(String text, num x, num y, [num maxWidth = null]) native;
 
-  ImageDataJs getImageData(num sx, num sy, num sw, num sh) native;
+  _ImageDataJs getImageData(num sx, num sy, num sw, num sh) native;
 
   bool isPointInPath(num x, num y) native;
 
   void lineTo(num x, num y) native;
 
-  TextMetricsJs measureText(String text) native;
+  _TextMetricsJs measureText(String text) native;
 
   void moveTo(num x, num y) native;
 
-  void putImageData(ImageDataJs imagedata, num dx, num dy, [num dirtyX = null, num dirtyY = null, num dirtyWidth = null, num dirtyHeight = null]) native;
+  void putImageData(_ImageDataJs imagedata, num dx, num dy, [num dirtyX = null, num dirtyY = null, num dirtyWidth = null, num dirtyHeight = null]) native;
 
   void quadraticCurveTo(num cpx, num cpy, num x, num y) native;
 
   void rect(num x, num y, num width, num height) native;
 
   void restore() native;
 
   void rotate(num angle) native;
 
   void save() native;
@@ skipping 23 matching lines @@
   void stroke() native;
 
   void strokeRect(num x, num y, num width, num height, [num lineWidth = null]) native;
 
   void strokeText(String text, num x, num y, [num maxWidth = null]) native;
 
   void transform(num m11, num m12, num m21, num m22, num dx, num dy) native;
 
   void translate(num tx, num ty) native;
 }