Add support for the "repaint" layout tests (LayoutTests/fast/repaint/*), whic...

skia/ext/bitmap_platform_device_win.h

Index: skia/ext/bitmap_platform_device_win.h
===================================================================
--- skia/ext/bitmap_platform_device_win.h	(revision 9433)
+++ skia/ext/bitmap_platform_device_win.h	(working copy)
@@ -67,6 +67,11 @@
   virtual void fixupAlphaBeforeCompositing();
   virtual bool IsVectorial() { return false; }
 
+  // Replaces occurrences of kMagicTransparencyColor with black. See
+  // fixupAlphaBeforeCompositing()'s documentation in platform_device_win.h for
+  // an explanation of why this is needed.
+  static void fixupAlpha(SkBitmap& bitmap);
+
   // Returns the color value at the specified location. This does not
   // consider any transforms that may be set on the device.
   SkColor getColorAt(int x, int y);